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Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Details)
$ in Thousands
9 Months Ended
Jun. 30, 2022
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Balance as of September 30, 2021 $ 1,128,511
Effect of foreign currency translation (13,955)
Balance as of June 30, 2022 $ 1,114,556