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Goodwill and Intangible Assets - Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 154,158 | $ 142,180
Accumulated Amortization | (106,837) | (94,266)
Total | $ 47,321 | $ 47,914
Average Life | 8 years | 8 years
Completed technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 87,820 | $ 87,050
Accumulated Amortization | (67,769) | (61,189)
Total | $ 20,051 | $ 25,861
Average Life | 5 years | 5 years
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 65,762 | $ 55,130
Accumulated Amortization | (38,930) | (33,077)
Total | $ 26,832 | $ 22,053
Average Life | 12 years | 13 years
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 576 | $ 0
Accumulated Amortization | (138) | 0
Total | $ 438 | $ 0
Average Life | 3 years |

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + 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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- 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=26713463&loc=d3e16323-109275 + Details
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