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Goodwill and Intangible Assets, Net - Amortization Expense on Definite-Lived Intangible Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |
Cost of revenue | $ 1,405 | $ 1,609 | $ 1,609
Amortization of definite-lived purchased intangible assets | 108,453 | 96,465 | 65,017
Total | $ 109,858 | $ 98,074 | $ 66,626

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- Definition Amortization Of Definite - Lived Purchased Intangible Assets + References No definition available. + Details
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- Definition Amortization of intangible assets net. + References No definition available. + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the costs of intangible assets over the expected benefit period of such assets. This element applies only to intangible assets used in the delivery of services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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