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Goodwill and Intangible Assets, Net - Details Regarding Total Definite-Lived Purchased Intangible Assets (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
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Finite-Lived Intangible Assets [Line Items] |  |
Gross | $ 1,187,507 | $ 1,181,850
Accumulated Amortization | (1,010,181) | (900,323)
Total | 177,326 | 281,527
Core Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | 604,673 | 604,673
Accumulated Amortization | (513,501) | (451,169)
Total | 91,172 | 153,504
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | 497,296 | 491,639
Accumulated Amortization | (414,654) | (370,658)
Total | 82,642 | 120,981
Intellectual Property Rights and Purchased Computer Software [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | 51,996 | 51,996
Accumulated Amortization | (51,996) | (51,996)
Other [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | 33,542 | 33,542
Accumulated Amortization | (30,030) | (26,500)
Total | $ 3,512 | $ 7,042

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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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