LEASES - Operating Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Lease cost under long-term operating leases	$ 3,263	$ 3,276	$ 6,525	$ 6,521
Lease cost under short-term operating leases	1,567	897	2,380	1,749
Variable lease cost under short-term and long-term operating leases	1,068	1,063	1,950	2,275
Total operating lease cost	$ 5,898	$ 5,236	$ 10,855	$ 10,545