OTHER ACCRUED EXPENSES: (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Mar. 31, 2022
Business Acquisition [Line Items]
Liabilities of non-qualified retirement plan	$ 11,704	$ 15,528
Short-term lease liabilities (see Note 4)	10,256	8,984
Other miscellaneous accrued expenses	12,256	10,864
Other accrued expenses	40,667	46,067
Rakam Technology Asset Acquisition
Business Acquisition [Line Items]
Rakam consideration holdback	223	223
Data Plus Math Corporation
Business Acquisition [Line Items]
Business combination, contingent consideration, liability, current	0	6,092
Acuity Data
Business Acquisition [Line Items]
Business combination, contingent consideration, liability, current	1,251	2,420
DataFleets, Ltd
Business Acquisition [Line Items]
Business combination, contingent consideration, liability, current	3,777	756
Diablo.AI, Inc.
Business Acquisition [Line Items]
Business combination, contingent consideration, liability, current	$ 1,200	$ 1,200