PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2019
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 5,300	$ 2,700
Accelerated depreciation	1,900
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	68,654		$ 64,852
Less accumulated depreciation and amortization	44,047		38,809
Property and equipment, net of accumulated depreciation and amortization	24,607		26,043
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	22,380		20,097
Data processing equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	37,798		37,678
Office furniture and other equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 8,476		$ 7,077