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PROPERTY AND EQUIPMENT: (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Mar. 31, 2021
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 44,658 $ 44,284
Less accumulated depreciation and amortization 34,035 32,327
Property and equipment, net of accumulated depreciation and amortization 10,623 11,957
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 26,107 26,024
Data processing equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 9,243 9,053
Office furniture and other equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 9,308 $ 9,207