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Goodwill and Intangibles, net - Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Sep. 30, 2018
--- | --- | ---
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 391,813 | $ 391,515
Accum. Amortization | 302,324 | 293,071
Net | 89,489 | 98,444
Customer Lists |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 359,073 | 358,776
Accum. Amortization | 288,214 | 279,990
Net | 70,859 | 78,786
Trade Names And Other Intangibles |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 32,740 | 32,739
Accum. Amortization | 14,110 | 13,081
Net | $ 18,630 | $ 19,658

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