RecursionError in EDGAR 26.1 on presentation structures with recursive arcs

[austinmatherne-wk]

Hi @freddym56,

EDGAR 26.1 logs a traceback on a recursion error when processing filings that contain recursive presentation relationships (e.g. conceptA → conceptB → conceptA).

This appears to be related to this change: https://github.com/Arelle/EDGAR/pull/58/changes#diff-bbaebc86d60d6d979a2f02dbcfde880c4b2d7355d61d25c6b188dd323f02793eL113

To Reproduce

1. Download: filing_documents.zip
2. Run:

   python arelleCmdLine.py --plugin EDGAR --disclosureSystem efm-pragmatic --validate --file filing_documents.zip

Stack Trace

Exception in filing end processing, traceback: ['Traceback (most recent call last):
', '  File "/Users/austinmatherne/git/Arelle/arelle/plugin/EDGAR/render/__init__.py", line 1090, in filingEnd
    Filing.mainFun(self, report, self.reportsFolder, transform=reportXslt, rFilePrefix=rFilePrefix)  # dissem suffix
    ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
', '  File "/Users/austinmatherne/git/Arelle/arelle/plugin/EDGAR/render/Filing.py", line 43, in mainFun
    filing.cubeDriverBeforeFlowThroughSuppression(cube)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
', '  File "/Users/austinmatherne/git/Arelle/arelle/plugin/EDGAR/render/Filing.py", line 934, in cubeDriverBeforeFlowThroughSuppression
    cube.presentationGroup.startPreorderTraversal()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
', '  File "/Users/austinmatherne/git/Arelle/arelle/plugin/EDGAR/render/PresentationGroup.py", line 169, in startPreorderTraversal
    self.doPreorderTraversal(self.rootNodeList[0], giveMemGetPositionDictPrimary, {}, None, set(), visited, visitCounter, 0)
    ~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
', '  File "/Users/austinmatherne/git/Arelle/arelle/plugin/EDGAR/render/PresentationGroup.py", line 258, in doPreorderTraversal
    self.doPreorderTraversal(childNode, giveMemGetPositionDictPrimary, {}, parentAxis, setOfConcepts, visited, visitCounter, depth)
    ~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
', '  File "/Users/austinmatherne/git/Arelle/arelle/plugin/EDGAR/render/PresentationGroup.py", line 258, in doPreorderTraversal
    self.doPreorderTraversal(childNode, giveMemGetPositionDictPrimary, {}, parentAxis, setOfConcepts, visited, visitCounter, depth)
    ~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
', '  File "/Users/austinmatherne/git/Arelle/arelle/plugin/EDGAR/render/PresentationGroup.py", line 258, in doPreorderTraversal
    self.doPreorderTraversal(childNode, giveMemGetPositionDictPrimary, {}, parentAxis, setOfConcepts, visited, visitCounter, depth)
    ~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
', '  [Previous line repeated 981 more times]
', '  File "/Users/austinmatherne/git/Arelle/arelle/plugin/EDGAR/render/PresentationGroup.py", line 248, in doPreorderTraversal
    self.buildLabel(concept, preferredLabel)
    ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^
', '  File "/Users/austinmatherne/git/Arelle/arelle/plugin/EDGAR/render/PresentationGroup.py", line 283, in buildLabel
    labelStr = concept.label(preferredLabel=preferredLabel, fallbackToQname=False, lang=self.filing.controller.labelLangs)
', '  File "/Users/austinmatherne/git/Arelle/arelle/ModelDtsObject.py", line 640, in label
    label = labelsRelationshipSet.label(self, preferredLabel, _lang, linkroleHint=linkroleHint)
', '  File "/Users/austinmatherne/git/Arelle/arelle/ModelRelationshipSet.py", line 357, in label
    labels = self.fromModelObject(modelFrom)
', '  File "/Users/austinmatherne/git/Arelle/arelle/ModelRelationshipSet.py", line 254, in fromModelObject
    return self.loadModelRelationshipsFrom().get(modelFrom, [])
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
', 'RecursionError: maximum recursion depth exceeded
'] - IXDS test-20260321.htm

Environment

• EDGAR plugin version: 26.1
• Arelle: 2.39.2