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Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
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Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 391,515 | $ 378,831
Accum. Amortization | 293,071 | 273,613
Net | 98,444 | 105,218
Customer Lists |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 358,776 | 346,784
Accum. Amortization | 279,990 | 264,632
Net | 78,786 | 82,152
Trade Names And Other Intangibles |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 32,739 | 32,047
Accum. Amortization | 13,081 | 8,981
Net | $ 19,658 | $ 23,066

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