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Derivative Financial Instruments - Summary of Outstanding Forward Foreign Currency Contracts by Currency (Details) - Foreign Currency Forward Contracts - Not Designated as Hedging Instrument € in Thousands, £ in Thousands, $ in Thousands, $ in Thousands | Sep. 30, 2021 EUR (€) | Sep. 30, 2021 USD ($) | Sep. 30, 2021 GBP (£) | Sep. 30, 2021 SGD ($) | Sep. 30, 2020 EUR (€) | Sep. 30, 2020 USD ($) | Sep. 30, 2020 GBP (£) | Sep. 30, 2020 SGD ($)
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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 | € 17,100 | $ 19,829 |  |  | € 15,000 | $ 17,656 |  |
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 |  | 15,400 | £ 11,467 |  |  | 21,300 | £ 16,555 |
Fair value of forward foreign currency contracts to sell and buy foreign currency |  | 0 |  |  |  | 0 |  |
Foreign Exchange Contracts To Purchase Singapore Dollars With United States Dollars | Long |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Contract amount of forward foreign currency contracts |  | 4,900 |  | $ 6,650 |  | 5,700 |  | $ 7,815
Fair value of forward foreign currency contracts to sell and buy foreign currency |  | $ 0 |  |  |  | $ 0 |  |

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