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Intangible Assets Subject to Amortization (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Sep. 30, 2018
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 391,812 $ 391,515
Accum. Amortization 297,693 293,071
Net 94,119 98,444
Customer Lists    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount 359,073 358,776
Accum. Amortization 284,098 279,990
Net 74,975 78,786
Trade Names And Other Intangibles    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount 32,739 32,739
Accum. Amortization 13,595 13,081
Net $ 19,144 $ 19,658