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Goodwill and Intangibles, net - Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 417,467 | $ 391,515
Accum. Amortization | 307,145 | 293,071
Net | 110,322 | 98,444
Customer Lists |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 381,890 | 358,776
Accum. Amortization | 292,522 | 279,990
Net | 89,368 | 78,786
Trade Names And Other Intangibles |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 35,577 | 32,739
Accum. Amortization | 14,623 | 13,081
Net | $ 20,954 | $ 19,658

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