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Leases - Operating Lease Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Leases [Abstract]    
Operating lease expense $ 11,914 $ 12,181
Short-term lease expense 556 986
Variable lease expense 6,244 7,026
Total lease expense $ 18,714 $ 20,193