v3.25.2
Goodwill and Intangible Assets - Schedule of Goodwill and Acquired Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Sep. 30, 2024
Goodwill $ 3,497,012 $ 3,461,891
Intangible assets with finite lives, Gross Carrying Amount 1,855,330 1,840,304
Intangible assets with finite lives, Accumulated Amortization 1,010,511 942,828
Intangible assets with finite lives, Net Book Value 844,819 897,476
Intangible Assets, Net (Including Goodwill) 4,341,831 4,359,367
Purchased Software    
Intangible assets with finite lives, Gross Carrying Amount 639,597 634,439
Intangible assets with finite lives, Accumulated Amortization 464,507 436,471
Intangible assets with finite lives, Net Book Value 175,090 197,968
Capitalized Software    
Intangible assets with finite lives, Gross Carrying Amount 22,877 22,877
Intangible assets with finite lives, Accumulated Amortization 22,877 22,877
Intangible assets with finite lives, Net Book Value 0 0
Customer Lists and Relationships    
Intangible assets with finite lives, Gross Carrying Amount 1,150,597 1,141,086
Intangible assets with finite lives, Accumulated Amortization 495,329 457,718
Intangible assets with finite lives, Net Book Value 655,268 683,368
Trademarks and Trade Names    
Intangible assets with finite lives, Gross Carrying Amount 38,233 37,961
Intangible assets with finite lives, Accumulated Amortization 23,772 21,821
Intangible assets with finite lives, Net Book Value 14,461 16,140
Other    
Intangible assets with finite lives, Gross Carrying Amount 4,026 3,941
Intangible assets with finite lives, Accumulated Amortization 4,026 3,941
Intangible assets with finite lives, Net Book Value $ 0 $ 0