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, 2022 EUR (€)	Sep. 30, 2022 USD ($)	Sep. 30, 2022 GBP (£)	Sep. 30, 2022 SGD ($)	Sep. 30, 2021 EUR (€)	Sep. 30, 2021 USD ($)	Sep. 30, 2021 GBP (£)	Sep. 30, 2021 SGD ($)
Foreign Exchange Contracts To Sell European Euro for US Dollar | Short
Derivative [Line Items]
Contract amount of forward foreign currency contracts	€ 13,500	$ 13,158			€ 17,100	$ 19,829
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		13,100	£ 11,848			15,400	£ 11,467
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		4,300		$ 6,169		4,900		$ 6,650
Fair value of forward foreign currency contracts to sell and buy foreign currency		$ 0				$ 0