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Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 378,831 | $ 354,522
Accum. Amortization | 273,613 | 256,866
Net | 105,218 | 97,656
Customer Lists |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 346,784 | 327,388
Accum. Amortization | 264,632 | 250,427
Net | 82,152 | 76,961
Trade Names And Other Intangibles |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 32,047 | 27,134
Accum. Amortization | 8,981 | 6,439
Net | $ 23,066 | $ 20,695

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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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