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Goodwill and Other Intangible Assets - Intangible Assets Subject to Amortization (Detail) - USD ($)
$ in Thousands
Sep. 30, 2022
Sep. 30, 2021
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