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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 ($)
Sep. 30, 2020
GBP (£)
Sep. 30, 2020
SGD ($)
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