PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Mar. 31, 2018
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 10,700	$ 8,900
Accelerated depreciation	2,000
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	58,782		$ 62,353
Less accumulated depreciation and amortization	34,195		30,013
Property and equipment, net of accumulated depreciation and amortization	24,587		32,340
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	16,920		15,635
Data processing equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	35,727		39,938
Office furniture and other equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 6,135		$ 6,780