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Intangible Assets Subject to Amortization (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Sep. 30, 2016
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 357,286 $ 354,522
Accum. Amortization 260,723 256,866
Net 96,563 97,656
Customer Lists    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 328,852 327,388
Accum. Amortization 253,936 250,427
Net 74,916 76,961
Trade Names And Other Intangibles    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 28,434 27,134
Accum. Amortization 6,787 6,439
Net $ 21,647 $ 20,695