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Goodwill and Intangible Assets, Net - Details Regarding Total Definite-Lived Purchased Intangible Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014
Finite-Lived Intangible Assets [Line Items] |  |
Gross | $ 1,054,766 | $ 916,850
Accumulated Amortization | (802,249) | (735,623)
Total | 252,517 | 181,227
Core Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | 531,669 | 434,669
Accumulated Amortization | (398,898) | (367,609)
Total | $ 132,771 | $ 67,060
Core Technology [Member] | Minimum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated Useful Life | 2 years | 3 years
Core Technology [Member] | Maximum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated Useful Life | 8 years | 8 years
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | $ 439,435 | $ 398,519
Accumulated Amortization | (328,747) | (297,791)
Total | $ 110,688 | $ 100,728
Customer Relationships [Member] | Minimum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated Useful Life | 3 years | 4 years
Customer Relationships [Member] | Maximum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated Useful Life | 15 years | 15 years
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 | 31,666 | 31,666
Accumulated Amortization | (22,608) | (18,227)
Total | $ 9,058 | $ 13,439
Other [Member] | Minimum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated Useful Life | 3 years | 1 year
Other [Member] | Maximum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated Useful Life | 10 years | 10 years

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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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=26713463&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=26713463&loc=d3e16323-109275 + Details
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