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Derivative Financial Instruments - Summary of Outstanding Forward Foreign Currency Contracts by Currency (Detail) € in Thousands, £ in Thousands, $ in Thousands, $ in Thousands | Mar. 31, 2020 GBP (£) | Mar. 31, 2020 SGD ($) | Mar. 31, 2020 EUR (€) | Mar. 31, 2020 USD ($) | Sep. 30, 2019 GBP (£) | Sep. 30, 2019 SGD ($) | Sep. 30, 2019 EUR (€) | Sep. 30, 2019 USD ($)
--- | --- | --- | --- | --- | --- | --- | --- | ---
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 |  |  | € 10,000 | 11,004 |  |  | € 10,800 | 11,723
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 | £ 21,781 |  |  | 27,000 | £ 5,200 |  |  | 6,400
Foreign Exchange Contracts To Purchase Singapore Dollars 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 Singapore Dollars With US Dollars | Foreign currency forward contracts | Short | Not Designated as Hedging Instrument |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Contract amount of forward foreign currency contracts |  | $ 10,274 |  | $ 7,200 |  | $ 5,798 |  | $ 4,200

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