v3.26.1
Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($)
$ in Millions
Jun. 30, 2026
Sep. 30, 2025
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Value, finite lives $ 109 $ 106
Accumulated Amortization (57) (51)
Net Intangible Assets, finite lives 52 55
Developed Technologies [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Value, finite lives 42 41
Accumulated Amortization (16) (14)
Net Intangible Assets, finite lives 26 27
Trademarks [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Value, finite lives 2 2
Accumulated Amortization (1) (1)
Net Intangible Assets, finite lives 1 1
Customer Relationships [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Value, finite lives 65 63
Accumulated Amortization (40) (36)
Net Intangible Assets, finite lives $ 25 $ 27