PROPERTY AND EQUIPMENT: (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Mar. 31, 2022
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 47,270	$ 45,001
Less accumulated depreciation and amortization	34,226	33,470
Property and equipment, net of accumulated depreciation and amortization	13,044	11,531
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	29,760	28,224
Data processing equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,864	7,001
Office furniture and other equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 9,646	$ 9,776