PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Mar. 31, 2020
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 4,800	$ 10,400
Accelerated depreciation		$ 3,600
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	43,604		$ 44,786
Less accumulated depreciation and amortization	28,382		25,465
Property and equipment, net of accumulated depreciation and amortization	15,222		19,321
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	25,987		25,614
Data processing equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	8,511		9,499
Office furniture and other equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 9,106		$ 9,673