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Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Details)
$ in Thousands
6 Months Ended
Mar. 31, 2023
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Balance as of September 30, 2022 $ 890,802
Effect of foreign currency translation 13,248
Balance as of December 31, 2022 $ 904,050