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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 | Dec. 31, 2020 EUR (€) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 GBP (£) | Dec. 31, 2020 SGD ($) | Sep. 30, 2020 EUR (€) | Sep. 30, 2020 USD ($) | Sep. 30, 2020 GBP (£) | Sep. 30, 2020 SGD ($)
--- | --- | --- | --- | --- | --- | --- | --- | ---
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 | € 18,900 | 23,068 |  |  | € 15,000 | 17,656 |  |
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 |  | 16,400 | £ 12,034 |  |  | 21,300 | £ 16,555 |
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 |  | $ 5,100 |  | $ 6,725 |  | $ 5,700 |  | $ 7,815

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