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Summary of Outstanding Forward Foreign Currency Contracts by Currency (Detail)
€ in Thousands, £ in Thousands, CAD in Thousands, $ in Thousands
Jun. 30, 2015
CAD
Jun. 30, 2015
GBP (£)
Jun. 30, 2015
EUR (€)
Jun. 30, 2015
USD ($)
Sep. 30, 2014
CAD
Sep. 30, 2014
GBP (£)
Sep. 30, 2014
EUR (€)
Sep. 30, 2014
USD ($)
Foreign Exchange Contracts to Sell Canadian Dollar for US Dollar                
Derivative [Line Items]                
Fair value of forward foreign currency contracts to sell and buy foreign currency       $ 0       $ 0
Foreign Exchange Contracts to Sell Canadian Dollar for US Dollar | Foreign currency forward contracts | Short | Not Designated as Hedging Instrument                
Derivative [Line Items]                
Contract amount of forward foreign currency contracts CAD 4,000     3,208 CAD 3,300     2,960
Foreign Exchange Contracts To Sell European Euro for US Dollar                
Derivative [Line Items]                
Fair value of forward foreign currency contracts to sell and buy foreign currency       0       0
Foreign Exchange Contracts To Sell European Euro for US Dollar | Foreign currency forward contracts | Short | Not Designated as Hedging Instrument                
Derivative [Line Items]                
Contract amount of forward foreign currency contracts     € 6,600 7,389     € 3,800 4,790
Foreign Exchange Contracts To Purchase British Pounds With US Dollars                
Derivative [Line Items]                
Fair value of forward foreign currency contracts to sell and buy foreign currency       0       0
Foreign Exchange Contracts To Purchase British Pounds With US Dollars | Foreign currency forward contracts | Short | Not Designated as Hedging Instrument                
Derivative [Line Items]                
Contract amount of forward foreign currency contracts   £ 4,397   $ 6,900   £ 6,795   $ 11,000