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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, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |
Cost of revenue | $ 572 | $ 1,405 | $ 1,609
Amortization of definite-lived purchased intangible assets | 105,213 | 108,453 | 96,465
Total | $ 105,785 | $ 109,858 | $ 98,074

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- Definition Amount of expense for allocation of cost of intangible asset over its useful life directly used in production of good and rendering of service. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(2)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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