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Intangible Assets Subject to Amortization (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013
Finite-Lived Intangible Assets [Line Items] |  |
Total | $ 47,914 | $ 57,361
Foreign currency translation adjustments |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total | 528 | 157
Finite Lived Intangible Assets Before Translation Adjustment |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 141,387 | 141,155
Accumulated Amortization | (94,001) | (83,951)
Total | 47,386 | 57,204
Average Life | 8 years | 8 years
Finite Lived Intangible Assets Before Translation Adjustment | Completed technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 86,397 | 84,604
Accumulated Amortization | (60,933) | (53,347)
Total | 25,464 | 31,257
Average Life | 5 years | 5 years
Finite Lived Intangible Assets Before Translation Adjustment | Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 54,990 | 56,321
Accumulated Amortization | (33,068) | (30,422)
Total | 21,922 | 25,899
Average Life | 13 years | 13 years
Finite Lived Intangible Assets Before Translation Adjustment | Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 0 | 230
Accumulated Amortization | 0 | (182)
Total | $ 0 | $ 48
Average Life |  | 1 year

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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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- 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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- 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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