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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, $ in Thousands | Sep. 30, 2017 GBP (£) | Sep. 30, 2017 EUR (€) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 GBP (£) | Sep. 30, 2016 EUR (€) | Sep. 30, 2016 USD ($)
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Foreign Exchange Contracts To Sell European Euro for US Dollar | Short |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Contract amount of forward foreign currency contracts |  | € 5,050 | $ 5,968 |  | € 7,850 | $ 8,743
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 | £ 9,341 |  | 12,500 | £ 7,721 |  | 10,000
Fair value of forward foreign currency contracts to sell and buy foreign currency |  |  | $ 0 |  |  | $ 0

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