Goodwill and Intangible Assets - Schedule of Intangible Assets (Parenthetical) (Detail) $ in Millions |
9 Months Ended |
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Jun. 30, 2026
USD ($)
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| Intangible Asset, Finite-Lived [Line Items] | |
| Intangible assets acquired | $ 2 |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of increase in finite-lived intangible asset acquired in business combination, asset acquisition, and from joint venture formation. Excludes goodwill and capitalized cost for software to be sold, leased, or marketed. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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