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Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Sep. 30, 2017
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Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 379,042 | $ 378,831
Accum. Amortization | 278,399 | 273,613
Net | 100,643 | 105,218
Customer Lists |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 346,995 | 346,784
Accum. Amortization | 268,362 | 264,632
Net | 78,633 | 82,152
Trade Names And Other Intangibles |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 32,047 | 32,047
Accum. Amortization | 10,037 | 8,981
Net | $ 22,010 | $ 23,066

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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/presentationRef -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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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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