Fair Value Measurements - Armada - Annual - Summary of Fair Value Hierarchy of the Valuation Inputs the Company (Detail) - Armada Acquisition Corp. II - USD ($)	Jun. 30, 2026	Sep. 30, 2025	May 22, 2025
Fair Value Assets Measured On Basis Valuation Techniques [Line Items]
Cash and marketable securities held in Trust Account	$ 241,164,305	$ 234,628,166	$ 231,150,000
Level 1
Fair Value Assets Measured On Basis Valuation Techniques [Line Items]
Cash and marketable securities held in Trust Account	$ 241,164,305	$ 234,628,166

The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 860
-SubTopic 30
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480031/860-30-S50-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant