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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, 2024 EUR (€) | Mar. 31, 2024 USD ($) | Mar. 31, 2024 GBP (£) | Mar. 31, 2024 SGD ($) | Sep. 30, 2023 EUR (€) | Sep. 30, 2023 USD ($) | Sep. 30, 2023 GBP (£) | Sep. 30, 2023 SGD ($)
--- | --- | --- | --- | --- | --- | --- | --- | ---
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 | € 9,000 | 9,718 |  |  | € 12,900 | 13,621 |  |
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 |  | 12,200 | £ 9,670 |  |  | 13,100 | £ 10,700 |
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 |  | $ 7,800 |  | $ 10,487 |  | $ 6,300 |  | $ 8,569

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