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Other Balance Sheet Items - Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents [Abstract]    
Interest payments $ 19,262 $ 17,755
Income tax payments $ 31,926 $ 50,531