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Goodwill and Intangible Assets, net - Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands | Mar. 31, 2025 | Sep. 30, 2024
--- | --- | ---
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 536,713 | $ 499,235
Accum. Amortization | 410,135 | 400,523
Net | 126,578 | 98,712
Customer Lists |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 481,077 | 452,340
Accum. Amortization | 382,372 | 373,860
Net | 98,705 | 78,480
Trade Names And Other Intangibles |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 55,636 | 46,895
Accum. Amortization | 27,763 | 26,663
Net | $ 27,873 | $ 20,232

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