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LEASES - Operating Lease Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Leases [Abstract]        
Operating lease expense $ 3,833 $ 4,156 $ 7,583 $ 6,241
Variable lease expense $ 857 $ 229 $ 1,639 $ 438