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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, 2024 EUR (€) | Sep. 30, 2024 USD ($) | Sep. 30, 2024 GBP (£) | Sep. 30, 2024 SGD ($) | Sep. 30, 2023 EUR (€) | Sep. 30, 2023 USD ($) | Sep. 30, 2023 GBP (£) | Sep. 30, 2023 SGD ($)
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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 | € 13,000 | $ 14,531 |  |  | € 12,900 | $ 13,621 |  |
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 |  | 16,400 | £ 12,237 |  |  | 13,100 | £ 10,700 |
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 |  | 5,800 |  | $ 7,404 |  | 6,300 |  | $ 8,569
Fair value of forward foreign currency contracts to sell and buy foreign currency |  | $ 0 |  |  |  | $ 0 |  |

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