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Intangible Assets Subject to Amortization (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Sep. 30, 2015
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 353,971 $ 348,801
Accum. Amortization 252,965 241,484
Net 101,006 107,317
Customer Lists    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 326,878 322,027
Accum. Amortization 246,876 236,438
Net 80,002 85,589
Trade Names And Other Intangibles    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 27,093 26,774
Accum. Amortization 6,089 5,046
Net $ 21,004 $ 21,728