PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2019
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 12,800	$ 10,700
Accelerated depreciation	3,600	$ 2,000
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	43,519		$ 64,852
Less accumulated depreciation and amortization	23,137		38,809
Property and equipment, net of accumulated depreciation and amortization	20,382		26,043
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	24,964		20,097
Data processing equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	9,552		37,678
Office furniture and other equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 9,003		$ 7,077