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Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Sep. 30, 2015
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 354,522 | $ 348,801
Accum. Amortization | 256,866 | 241,484
Net | 97,656 | 107,317
Customer Lists |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 327,388 | 322,027
Accum. Amortization | 250,427 | 236,438
Net | 76,961 | 85,589
Trade Names And Other Intangibles |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 27,134 | 26,774
Accum. Amortization | 6,439 | 5,046
Net | $ 20,695 | $ 21,728

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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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