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Fair Value Measurements - Additional Information (Details) - USD ($)	Sep. 30, 2021	Jun. 30, 2021	May 31, 2021	Sep. 30, 2020	Aug. 31, 2017
3.75% Convertible Notes Due 2022
Financial assets
Interest rate (as a percent)	3.75%	3.75%	3.75%	3.75%	3.75%
Forward Currency Exchange Contracts
Financial assets
Outstanding forward currency exchange contracts	$ 58,276,000	$ 54,201,000
Forward Currency Exchange Contracts \| Level 2
Financial assets
Fair value of currency contract based on exchange rate	$ 58,300,000	$ 54,200,000