PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 15,300	$ 15,600	$ 11,800
Accelerated depreciation	3,600	3,800
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	44,786	64,852
Less accumulated depreciation and amortization	25,465	38,809
Property and equipment, net of accumulated depreciation and amortization	19,321	26,043
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	25,614	20,097
Data processing equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	9,499	37,678
Office furniture and other equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 9,673	$ 7,077