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Goodwill and Other Intangible Assets - Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Sep. 30, 2021
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Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 451,716 | $ 444,461
Accum. Amortization | 367,206 | 348,987
Net | 84,510 | 95,474
Customer Lists |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 409,980 | 403,913
Accum. Amortization | 345,237 | 329,406
Net | 64,743 | 74,507
Trade Names And Other Intangibles |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 41,736 | 40,548
Accum. Amortization | 21,969 | 19,581
Net | $ 19,767 | $ 20,967

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