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Derivative Financial Instruments - Summary of Outstanding Forward Foreign Currency Contracts by Currency (Detail) - Foreign Currency Forward Contracts - Not Designated as Hedging Instrument € in Thousands, £ in Thousands, CAD in Thousands, $ in Thousands | Sep. 30, 2016 GBP (£) | Sep. 30, 2016 EUR (€) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 CAD | Sep. 30, 2015 GBP (£) | Sep. 30, 2015 EUR (€) | Sep. 30, 2015 USD ($)
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Foreign Exchange Contracts To Sell Canadian Dollar For US Dollar | Short |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Contract amount of forward foreign currency contracts |  |  |  | CAD 2,750 |  |  | $ 2,045
Fair value of forward foreign currency contracts to sell and buy foreign currency |  |  |  |  |  |  | 0
Foreign Exchange Contracts To Sell European Euro for US Dollar | Short |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Contract amount of forward foreign currency contracts |  | € 7,850 | $ 8,743 |  |  | € 5,600 | 6,296
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 | Long |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Contract amount of forward foreign currency contracts | £ 7,721 |  | 10,000 |  | £ 6,943 |  | 10,550
Fair value of forward foreign currency contracts to sell and buy foreign currency |  |  | $ 0 |  |  |  | $ 0

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