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Leases - Operating Lease Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Leases [Abstract]        
Operating lease expense $ 11,870 $ 12,158 $ 23,784 $ 24,339
Short-term lease expense 619 575 1,175 1,561
Variable lease expense 6,034 5,310 12,278 12,336
Total lease expense $ 18,523 $ 18,043 $ 37,237 $ 38,236