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Income Taxes - Summary of Income (Loss) Before Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Income Tax Disclosure [Abstract]      
Domestic $ 41,199 $ (73,865) $ (112,077)
Foreign 350,556 208,571 132,377
Income before income taxes $ 391,755 $ 134,706 $ 20,300