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Leases - Lease Costs (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating lease cost $ 27,734 $ 25,250
Short-term lease cost 1,889 2,110
Variable lease cost 3,015 3,334
Total operating lease costs $ 32,638 $ 30,694