INCOME TAXES - LOSS CARRYFORWARDS (Details) - USD ($)	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating loss carryforwards
Total amount of undistributed earnings of foreign subsidiaries	$ 562,269,000	$ 410,095,000
Provision for foreign withholding taxes or U.S. income taxes, which may become payable if undistributed earnings of foreign subsidiaries are repatriated	0
Domestic
Operating loss carryforwards
Net operating loss carryforwards	39,506,000
Domestic | Expire from 2022 to 2027
Operating loss carryforwards
Net operating loss carryforwards	24,019,000
Domestic | Expire in 2029 to 2032
Operating loss carryforwards
Net operating loss carryforwards	13,195,000
Domestic | Expire in 2038
Operating loss carryforwards
Net operating loss carryforwards	2,292,000
Foreign
Operating loss carryforwards
Net operating loss carryforwards	12,351,000
Foreign | Expire 2023 to 2028
Operating loss carryforwards
Net operating loss carryforwards	3,606,000
Domestic Tax Authority
Operating loss carryforwards
Tax credit carryforward	160,793,000
Domestic Tax Authority | Expire 2029 to 2039
Operating loss carryforwards
Tax credit carryforward	$ 60,248,000