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Summary of Outstanding Forward Foreign Currency Contracts by Currency (Detail) € in Thousands, £ in Thousands, CAD in Thousands, $ in Thousands | Dec. 31, 2015 CAD | Dec. 31, 2015 GBP (£) | Dec. 31, 2015 EUR (€) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 CAD | Sep. 30, 2015 GBP (£) | Sep. 30, 2015 EUR (€) | Sep. 30, 2015 USD ($)
--- | --- | --- | --- | --- | --- | --- | --- | ---
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 2,000 |  |  | 1,439 | CAD 2,750 |  |  | 2,045
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 |  |  | € 6,550 | 7,149 |  |  | € 5,600 | 6,296
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 |  | £ 6,210 |  | $ 9,200 |  | £ 6,943 |  | $ 10,550

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