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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