LEASES - Operating Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Lease cost under long-term operating leases	$ 13,092	$ 13,318
Lease cost under short-term operating leases	3,678	4,172
Variable lease cost under short-term and long-term operating leases	3,800	4,259
Total operating lease cost	$ 20,570	$ 21,749