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Leases - Lease Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Leases [Abstract]    
Operating lease expense $ 15,624 $ 47,603
Variable lease expense 3,025 8,925
Total lease expense $ 18,649 $ 56,528