PROPERTY AND EQUIPMENT: (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 45,001	$ 44,284
Less accumulated depreciation and amortization	33,470	32,327
Property and equipment, net of accumulated depreciation and amortization	11,531	11,957
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	28,224	26,024
Data processing equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,001	9,053
Office furniture and other equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 9,776	$ 9,207