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Intangibles, net - Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Sep. 30, 2019
--- | --- | ---
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 421,241 | $ 420,112
Accum. Amortization | 322,996 | 312,424
Net | 98,245 | 107,688
Customer Lists |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 383,388 | 382,373
Accum. Amortization | 306,657 | 297,221
Net | 76,731 | 85,152
Trade Names And Other Intangibles |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 37,853 | 37,739
Accum. Amortization | 16,339 | 15,203
Net | $ 21,514 | $ 22,536

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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