Project updates

June 2026 Update

Fri, 26 Jun 2026 16:49:00 +0000

We missed our monthly update in May as members of the team were attending the 2026 XBRL Europe and Eurofiling conference in Paris. It was fantastic to connect in person with so many members of the Arelle community and to provide a preview of our upcoming Arelle viewer redesign.

Following that productive event, we are pleased to share our latest updates with the release of Arelle 2.41.5. This version introduces key regulatory updates, expanded API capabilities, and refined validation accuracy.

Standard & Regulatory Compliance

EDINET 2026 Support: Added support for EDINET 2026 along with new filing validations.
ESEF 2025: The ESEF 2025 disclosure systems are no longer marked as draft.

Data & Validation Accuracy

Table Constraints: Implemented Table Constraints restriction validation.
Negative-Number Check: Improved the accuracy of the iXBRL 1.1 negative-number check.
OIM XSD Validation: Added XSD type validation for CSV and JSON Open Information Model (OIM) formats.

System & Infrastructure Upgrades

Public API Addition: Exposed the PackageSource class as part of the public API.
Docker Updates: Resolved an issue to ensure that Docker images report the correct release version.
Windows Installer: Added system-wide shortcuts to the Windows installation process.
Typing Improvements: Continued expanding code health with more type hint coverage.

To get involved with future work, please join the Arelle team monthly standup on the fourth Tuesday of each month at 1400 UTC. Please contact us for meeting details.

April 2026 Update

Fri, 24 Apr 2026 04:43:00 +0000

In April, the Arelle team released version 2.39.11, introducing important regulatory finalizations, significant deployment optimizations, and internal code refactoring.

Compliance & Validation

ESEF 2025: Finalized support for the ESEF 2025 reporting cycle.
ESEF Authority Option: Introduced a new –esefAuthority configuration option across both the CLI and GUI.
xBRL-CSV Support: Added metadata validation for xBRL-CSV Table Constraints.

Performance & Infrastructure

Windows Performance: Significantly improved Windows startup performance, reducing launch time to 1–3 seconds.
DockerHub Availability: The official Arelle Docker image is now published to DockerHub. It can be run using:
docker run arelleproject/arelle:latest /opt/start.sh
Installer Enhancements: Refined the Arelle installer, successfully cutting its size in half.
Proxy Integration: Implemented improved proxy support for better environment compatibility.

Architecture & Code Quality

Refactoring: Separated core responsibilities by extracting the PackageManager and PluginManager into distinct classes.
Type Hints: Continued code modernization with more type hint coverage across the codebase.

To get involved with future work, please join the Arelle team monthly standup on the fourth Tuesday of each month at 1400 UTC. Please contact us for meeting details.

March 2026 Update

Fri, 27 Mar 2026 07:38:00 +0000

In March, the Arelle team released version 2.39.3, focusing on formula performance optimizations, validation updates, and new deployment and automation features.

Performance & Infrastructure

Solvency II Performance: Optimizations to the formula engine delivered up to 60% faster performance for Solvency II taxonomies.
Web Server Docker Image: Introduced an official web server Docker image (thanks to Ryan for this contribution).

Validation & Compliance

EDGAR 26.1: Added full support for the EDGAR 26.1 release.
Rule Refinements: Implemented several KVK and EDINET validation rule improvements.

Platform & Tooling

Validation Exit Codes: Added the validationExitCode option to allow returning non-zero exit codes when validation errors occur, aiding pipeline automation.
Data Parsing: Introduced an xBRL-CSV Table Constraints parser to handle complex table layouts.
Codebase Improvements: Continued adding more type hints to improve code stability and developer experience.

To get involved with future work, please join the Arelle team monthly standup on the fourth Tuesday of each month at 1400 UTC. Please contact us for meeting details.

February 2026 Update

Fri, 27 Feb 2026 04:18:00 +0000

February has been a highly productive month of refinement and acceleration for the Arelle project. With the release of Arelle 2.38.17 and iXBRL Viewer 1.4.88, we have delivered major performance optimizations, clearer project guidelines, and updated regulatory previews.

Here is what we accomplished this month:

Performance & Rendering Enhancements

Faster Load Times: We have optimized loading speeds, yielding a 15% load time improvement for US-GAAP taxonomies.
Table Linkbase: This update addresses and resolves critical Table Linkbase rendering bug fixes.

Validation & Compliance

EDGAR 26.1 Previews: Early-stage support is now live with EDGAR 26.1 preview builds.
Rule Improvements: We have made targeted DBA validation rule improvements and KVK validation rule improvements to strengthen our Danish and Dutch reporting support.

Infrastructure & Policy Updates

Official Versioning Policy: To provide more clarity and transparency around our releases, we have published our official Versioning Policy.
New Conformance Suite Runner: We have transitioned to a modernized testing setup. You can view the code and progress at our new conformance suite runner repository.

Arelle iXBRL Viewer (v1.4.88)

Visual Fixes: This release resolves an interface bug, providing a fix for column layout fact highlight wrapping to keep report presentation clean and readable.

To get involved with future work, please join the Arelle team monthly standup on the fourth Tuesday of each month at 1400 UTC. Please contact us for meeting details.

January 2026 Update

Fri, 30 Jan 2026 16:12:00 +0000

We are thrilled to kick off 2026 alongside our incredible Arelle and larger XBRL community! To start the new year strong, we have rolled out Arelle 2.38.7 and iXBRL Viewer 1.4.87, introducing several new draft validations and key infrastructure enhancements.

Here is what we worked on this month:

Regulatory & Validation Drafts

2025 Draft Standards: We have added draft validation support for both DBA 2025 and NL (Netherlands) inline 2025.
KVK Enhancements: This release includes targeted validation rule improvements for the Dutch Chamber of Commerce (KVK).

Platform & Infrastructure Upgrades

Python 3.14 Support: We continue to ensure compatibility with modern environments by expanding Python 3.14 support to both the core Arelle platform and the iXBRL Viewer.
CI Runner Overhaul: Our development workflow received a major boost with a complete overhaul of our CI conformance suite runner.
Enhanced Type Safety: The iXBRL Viewer now includes full type hints for better code maintenance and developer experience.

To get involved with future work, please join the Arelle team monthly standup on the fourth Tuesday of each month at 1400 UTC. Please contact us for meeting details.

December 2025 Update

Tue, 23 Dec 2025 13:06:00 +0000

December has been an incredibly eventful month to close out the year! Alongside our latest technical milestones, the team connected with the broader reporting community at the virtual XBRL International Data Amplified conference. It was a fantastic opportunity to share insights and discuss the evolving landscape of digital financial reporting.

On the development front, we are capping off 2025 with a major milestone release: Arelle 2.38.0 and iXBRL Viewer 1.4.84.

Regulatory & Validation Milestones

EDGAR 25.4: Full support for the EDGAR 25.4 release is now live.
ESEF 2025 Draft: You can now prepare for upcoming European filings with our ready-to-use ESEF 2025 draft support.
EDINET Completion: We have achieved a major landmark with completely finalized EDINET validation support.
NL NT20 Preview: This update introduces initial preview validation support for the Dutch NT20 taxonomy.

Infrastructure & Code Modernization

Python 3.14 Alignment: To keep our stack future-proof, both Arelle and the iXBRL Viewer now include initial support for Python 3.14.
Enhanced Code Quality: Developers will benefit from significant type hint improvements in the core platform, alongside full type hints checking implemented across the iXBRL Viewer for greater stability.

As we look back on a highly productive year, the Arelle team wants to thank all of our users and contributors. Happy holidays, and we wish you all a happy and successful new year!

To get involved with future work, please join the Arelle team monthly standup on the fourth Tuesday of each month at 1400 UTC. Please contact us for meeting details.

November 2025 Update

Fri, 28 Nov 2025 09:18:00 +0000

November brings the release of Arelle 2.37.72 alongside iXBRL Viewer 1.4.80. This month, the development focus has shifted toward laying the groundwork for 2025 regulatory reporting standards, expanding international validation suites, and optimizing our delivery packages.

Platform & Validation Milestones

ESEF 2025 Preview: We have introduced work-in-progress (WIP) support for the ESEF 2025 disclosure system. This is currently incomplete but serves as an early foundation for upcoming filings.
EDINET Rules Milestone: We added more validation rules, bringing the total to 401 EDINET validation rules (now approximately 95% complete).
Netherlands iXBRL: Updated the platform to support Netherlands iXBRL 2025 validation requirements.
Command Line Improvement: A new –optionsFile argument has been introduced, allowing you to load CLI options directly from a JSON file for cleaner automation.

iXBRL Viewer Updates (v1.4.80)

Optimized Package Size: We have successfully reduced the footprint of both our Python and npm packages, ensuring a lighter and faster installation process.

To get involved with future work, please join the Arelle team monthly standup on the fourth Tuesday of each month at 1400 UTC. Please contact us for meeting details.

October 2025 Update

Fri, 24 Oct 2025 10:30:00 +0000

October has been a productive month for the Arelle project, marked by the release of Arelle 2.37.67 and iXBRL Viewer 1.4.77. These releases focus heavily on expanding regulatory coverage, resolving developer pain points, and refining the user interface.

Core Validation & Compliance

EDGAR Alignment: Full support is now available for EDGAR 25.3 & 25.3.1.
ESEF Progress: Implemented improved ESEF validations to streamline European reporting.
EDINET Expansion: Added 60+ more EDINET validation rules, pushing our total coverage to 87%.
Conformance Testing: Updated the XBRL dimensions conformance suite within our CI environment.

API & Developer Enhancements

Session API: Added source zip stream filename detection to the Session API.
Debugger Stability: Resolved a bug where the ModelObject was causing the Python debugger to crash.
Data Export: Implemented key bug fixes for the fact table XML output format.

iXBRL Viewer (v1.4.77)

Better Navigation: Dimensions in the Fact Properties panel are now sorted, making it significantly easier to read and explore distinct data points.

To get involved with future work, please join the Arelle team monthly standup on the fourth Tuesday of each month at 1400 UTC. Please contact us for meeting details.

September 2025 Update

Fri, 26 Sep 2025 08:38:00 +0000

September was another active month of development for the Arelle project, with updates rolling out across versions 2.37.50 through 2.37.60. This cycle brings a healthy mix of platform usability enhancements, diagnostic upgrades, and crucial regulatory updates.

Here is a breakdown of what’s new:

Regulatory & Validation Enhancements: This release introduces preview builds for EDGAR 25.3 and adds further Japanese EDINET validation rules. We have also made key LEI validation improvements.
Usability & GUI Updates: To streamline your workflow, you can now load EDINET manifests directly from the GUI. We’ve also improved plugin discovery to make managing extensions a smoother experience.
Logging & Diagnostics: Developers and power users will benefit from improved IXDS model reference logging, making troubleshooting much more straightforward.

To get involved with future work, please join the Arelle team monthly standup on the fourth Tuesday of each month at 1400 UTC. Please contact us for meeting details.

August 2025 Update

Sun, 31 Aug 2025 12:00:00 +0000

In August, the Arelle team released several updates across versions 2.37.43 through 2.37.53, focusing on enhancements to validation and data handling. Key updates included:

Validation and Conformance: The recognition of ROS 2025 taxonomies was added, and both the EFM and the new UKSEF conformance suites were updated.
EDINET Rules: New EDINET entries were added, and existing ones were updated for better efficiency.
Error Handling: Improvements were made to the ErrorManager and logging for embedded SVGs.
Fact Handling: A new function was created to replace old duplicate fact checks, and logging was added for duplicate fact set fact references.
Dependencies: Various dependency updates, including frequent Python and GitHub Action updates.

To get involved with future work, please join the Arelle team monthly standup on the fourth Tuesday of each month at 1400 UTC. Please contact us for meeting details.

July 2025 Update

Thu, 31 Jul 2025 12:00:00 +0000

The Arelle team delivered several updates in July 2025, from versions 2.37.29 through 2.37.42. The updates centered on extending validation and making various technical improvements to the platform. Key updates included:

EDINET Validation: The initial EDINET validation plugin and conformance suite were added, along with numerous EDINET rules.
Validation Improvements: The team added a new check for the extension taxonomy directory prefix for DK ESEF and improved the handling of test case variations with warnings.
Platform Enhancements: New features were introduced, such as support for logging image CSS selectors and a new function to get file sizes.
Bug Fixes: Fixes were addressed for issues like ROS.19 casting errors and a parenthesis grouping problem in the ROS.19 rule.
Dependencies: The minimum version of setuptools was bumped, and various dependency groups were updated.

To get involved with future work, please join the Arelle team monthly standup on the fourth Tuesday of each month at 1400 UTC. Please contact us for meeting details.

June 2025 Update

Mon, 30 Jun 2025 12:00:00 +0000

In June, the Arelle team released multiple updates across versions 2.37.19 through 2.37.28, which focused on expanding validation, improving platform infrastructure, and handling new features. Key updates included:

NL-KVK rules: Numerous new validations were added.
Infrastructure: The Python Session API was promoted from beta, and Mac builds were separated for Intel and Apple Silicon.
Conformance Suites: The ability to pass test case filters to the conformance suite runner was added, and the EFM conformance suite was updated for 25.2.
OIM Taxonomy: Improvements were made to OIM Taxonomy typing, and how the OIM taxonomy plugin was loaded.
Bug Fixes: A fix was implemented to handle None fact values when deduplicating facts.

To get involved with future work, please join the Arelle team monthly standup on the fourth Tuesday of each month at 1400 UTC. Please contact us for meeting details.

May 2025 Update

Fri, 30 May 2025 13:10:00 +0000

This month, the Arelle team added support for EDGAR 25.2 preview builds and expanded validation coverage, including additional DBA and NL rules. Report package validation was also improved, and users can now save iXDS reports to OIM formats (JSON/CSV) directly from the GUI.

The iXBRL Viewer introduced better dark mode handling across multiple documents and tabs, along with support for Node.js 24.

To get involved with future work, please join the Arelle team monthly standup on the fourth Tuesday of each month at 1400 UTC. Please contact us for meeting details.

April 2025 Update

Fri, 25 Apr 2025 13:07:00 +0000

In April, the Arelle team delivered a series of infrastructure-focused updates, most notably adding support for Python 3.13 across both the platform and iXBRL Viewer.

Arelle 2.37.3 updates include:

Added support for Python 3.13
Introduced a new --inlineTarget CLI argument to specify inline target sets (e.g., --inlineTarget=DKGAAP)
Fixed a bug related to formula parameter resolution for iXDS target documents
Improved support for EBA 4.0, including fixes for loading xBRL-CSV files
Resolved an issue affecting behavior when running Arelle as a Windows service

The iXBRL Viewer also now supports Python 3.13, ensuring continued alignment with the latest platform infrastructure.

To get involved with future work, please join the Arelle team monthly standup on the fourth Tuesday of each month at 1400 UTC. Please contact us for meeting details.

March 2025 Update

Fri, 28 Mar 2025 13:05:00 +0000

March development focused on finalizing EDGAR 25.1 support, tightening ESEF conformance, and enhancing the accuracy and display of unit information across the platform.

Arelle 2.36.32 includes several updates:

EDGAR 25.1 support
ESEF 3.4.6 log locator reference handling
Fixes for the EBA table report plugin
DBA validation improvements
Option for deduplicated facts when saving to OIM
GUI bug fixes for calculation view

The iXBRL Viewer (1.4.62) now uses symbols from the UTR for all units—not just currencies—making non-monetary data like shares and percentages easier to interpret.

To get involved with future work, please join the Arelle team monthly standup on the fourth Tuesday of each month at 1400 UTC. Please contact us for meeting details.

February 2025 Update

Fri, 28 Feb 2025 13:00:00 +0000

This month’s updates focus on expanding validation support and enhancing the viewer experience, laying groundwork for upcoming regulatory changes and documentation improvements.

Arelle 2.36.16 includes:

EDGAR 25.1 preview builds
Bug fix for ESEF 1.4.1 data type checks
New option to add filenames to server POST requests
Continued expansion of DBA validation rules

iXBRL Viewer 1.4.59 introduces:

Support for persisting user language selection
New documentation project and early release of a user guide

To get involved with future work, please join the Arelle team monthly standup on the fourth Tuesday of each month at 1400 UTC. Please contact us for meeting details.

January 2025 Update

Fri, 31 Jan 2025 12:43:00 +0000

We’re kicking off the new year with several important enhancements to both the Arelle platform and iXBRL Viewer. The big news this month is the promotion of the ESEF 2024 validation plugin from beta, now fully supported and passing the ESEF 2024 conformance suite. This update supports continued alignment with evolving European filing requirements.

The platform also includes expanded DBA validation coverage and the introduction of EDGAR Plus iXViewer support across all SEC filings, providing a consistent viewer experience within EDGAR.

The latest viewer release improves clarity and accessibility by showing fact unit labels based on UTR descriptions. It also includes performance improvements and bug fixes to ensure a smoother user experience.

To get involved with future work, please join the Arelle team monthly standup on the fourth Tuesday of each month at 1400 UTC. Please contact us for meeting details.

December 2024 Update

Fri, 20 Dec 2024 12:39:00 +0000

Happy holidays from the Arelle team! As we close out the year, the final 2024 release delivers updates to both the platform and viewer, with a continued focus on regulatory support, validation enhancements, and accessibility.

Arelle 2.36.1 includes full support for the EDGAR 24.4 release, as well as the newly published Filing Index. Additional improvements include support for NT-19 validation, expanded DBA validation rules, and a fix for a GUI bug affecting the calculation view.

The latest iXBRL Viewer release (version 1.4.46) adds accessible highlight color options, fixes an XHTML validity issue, and includes additional translation improvements to support a growing global user base.

To get involved with future work, please join the Arelle team monthly standup on the fourth Tuesday of each month at 1400 UTC. Please contact us for meeting details.

November 2024 Update

Fri, 29 Nov 2024 12:34:00 +0000

We’ve made lots of improvements to the viewer this month! The latest release of the Arelle viewer introduces a suite of accessibility and usability improvements, including support for dark mode, tool tips explaining XBRL terms, and screen reader and keyboard navigation enhancements for WCAG compliance.

Translation support was also improved, with updated Spanish and Walsh localizations and a new option to customize the viewer interface with user-defined skins.

Arelle platform updates this month include:

Validation support for Report Package 1.0
End-of-life for Python 3.8
EDGAR 24.4 release candidate builds

To get involved with future work, please join the Arelle team monthly standup on the fourth Tuesday of each month at 1400 UTC. Please contact us for meeting details.

October 2024 Update

Fri, 25 Oct 2024 11:54:00 +0000

This month, the Arelle team has introduced support for Report Package 1.0 loading, enhancing the platform’s capabilities for structured data reporting. Additionally, we’ve updated the platform to support the EDGAR 24.3.1 release and Extensible Enumeration 2 schemas over HTTPS.

The Arelle 2.33.0 release also includes:

ESEF 2024 validation updates
Bug fixes for ESEF SVG validation comments
Improvements to the EBA HTML export plugin
Resolution of extra columns in relationship set reports
The Arelle Viewer 1.4.36 release includes a fix to the Calc 1.1 inspector

To get involved with future work, please join the Arelle team monthly standup on the fourth Tuesday of each month at 1400 UTC. Please contact us for meeting details.

September 2024 Update

Fri, 27 Sep 2024 11:52:00 +0000

The Arelle 2.31.2 release includes support for the official EDGAR 24.3 release, now available in the new EDGAR repo. This release also delivers updates across multiple regulators, including fixes for ROS validation, improvements to HMRC image validation and an update for ESEF 2024 validation.

A fix for the Japanese iXBRL manifest issue was also included.

In the Arelle iXBRL Viewer 1.4.35, bug fixes were made to the calculation inspector to improve display accuracy.

To get involved with future work, please join the Arelle team monthly standup on the fourth Tuesday of each month at 1400 UTC. Please contact us for meeting details.

August 2024 Update

Fri, 30 Aug 2024 09:24:00 +0000

This month’s update brings continued progress across the Arelle platform with enhancements focused on compliance, performance, and previewing what’s ahead.

The Arelle 2.30.25 release includes:

EDGAR 24.2 Update 1, incorporating the latest SEC changes
ROS validation updates, delivering improved support for reporting obligations under evolving regulatory standards
EDGAR 24.3 Release Candidate builds, now available for early testing in our new EDGAR repo as we prepare for the upcoming release

To get involved with future work, please join the Arelle team monthly standup on the fourth Tuesday of each month at 1400 UTC. Please contact us for meeting details.

July 2024 Update

Fri, 26 Jul 2024 09:20:00 +0000

This month’s Arelle updates include a variety of improvements to both the core Arelle platform and the Arelle iXBRL Viewer.

The Arelle 2.30.14 release includes support for the EDGAR 24.2 taxonomy, enhancements to the Session Python API, and the addition of more Danish Business Authority validation rules.

The Arelle iXBRL Viewer 1.4.30 release includes several new capabilities:

Calc 1.1 relationships now display directly in the viewer
Webserver support has been added
New support for vendor MMS Solutions AG, enhancing multi-vendor compatibility

To get involved with future work, please join the Arelle team monthly standup on the fourth Tuesday of each month at 1400 UTC. Please contact us for meeting details.

June 2024 Update

Fri, 28 Jun 2024 08:59:00 +0000

We are continuing to push forward with performance, platform stability, and regulatory updates this month across both the Arelle engine and the Arelle iXBRL Viewer.

This month’s release of Arelle 2.29.1 introduces early support for the upcoming EFM 24.2 update. Frozen builds now use Python 3.12, ensuring continued compatibility with the latest Python releases. We’ve also delivered a major performance improvement— loading xBRL-CSV reports is now up to 90% faster.

Other improvements include:

OIM loading now works out-of-the-box, with no plugin required
The validate/HMRC plugin has been renamed to validate/UK for clarity

The Arelle iXBRL Viewer 1.4.28 release adds support for vendor F19, improving coverage across multi-vendor workflows.

To get involved with future work, please join the Arelle team monthly standup on the fourth Tuesday of each month at 1400 UTC. Please contact us for meeting details.

April - May 2024 Update

Thu, 30 May 2024 14:52:44 +0000

We’re excited to announce the beta release of the Arelle Python API! You can read all about it on our documentation page.

In addition, Arelle now supports the latest US SEC Edgar Filing Manual (EFM) 24.1.1 update as well as additional DBA validation updates. We have also updated views to support the Calc 1.1 arc.

The Arelle Viewer version 1.4.27 was released, featuring data about the report creation software in the file information.

To get involved with future work please join the Arelle team monthly standup on the fourth Tuesday of each month at 1400 UTC. Please contact us for meeting details.

March 2024 Update

Tue, 26 Mar 2024 13:25:00 +0000

As the busy regulatory update season continues, the Arelle team is happy to report that full support for the US SEC EDGAR 24.1 release was completed shortly after the official release by the SEC.

The Arelle 2.25.3 release also included support for DTR 2024 validations, KVK conformance suites and UK FRC 2023 authority configuration.

A target document search filter was added to the Arelle viewer version 1.4.21 to enable easier and more accurate searching of multi document taxonomies.

To get involved with future work please join the Arelle team monthly standup on the fourth Tuesday of each month at 1400 UTC. Please contact us for meeting details.

February 2024 Update

Tue, 27 Feb 2024 14:52:00 +0000

As mentioned in last month’s update, this is our busy season for regulatory updates to the Arelle Platform. Much of the work in February involved adding support for a very large US SEC EDGAR update. Support for EDGAR 24.0.1, including the EDGAR 24.1 preview, was released as part of the Arelle 2.23.3 release.

The release also included updates to HMRC validations, support for duplicate fact validations, improved locale support and various web server updates.

The Arelle Viewer (1.4.18) release included support for displaying Calc 1.1 and for displaying the target document for facts in preparation for multi-document taxonomies.

To get involved with future work please join the Arelle team monthly standup on the fourth Tuesday of each month at 1400 UTC. Please contact us for meeting details.

January 2024 Update

Fri, 26 Jan 2024 13:31:00 +0000

Happy New Year from the Arelle team! We’ve been busy this month working on the latest releases to Arelle and the Arelle iXBRL Viewer.

The Arelle (2.21.3) release included a Calc1.1 Working Group update, performance improvements to CI, improvements to ESEF error messages and a new plugin integration test runner. It also included XULE runtime performance improvements and support for Python 3.12.

The Arelle Viewer (1.4.14) release included support for multi target documents and Python 3.12.

Its the busy season for regulatory validation updates, and we will be updating the Arelle validations accordingly.

To get involved with future work please join the Arelle team monthly standup on the fourth Tuesday of each month at 1400 UTC. Please contact us for meeting details.