SEGMENT REPORTING, Technology Segment Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Abstract]
Net sales	$ 458,017	$ 433,081	$ 874,666	$ 788,112
Less: Revenue from financing and other	(25,902)	(19,696)	(40,592)	(39,780)
Revenue from contracts with customers	432,115	413,385	834,074	748,332
Technology Segment [Member]
Disaggregation of Revenue [Abstract]
Net sales	436,301	419,359	836,659	760,583
Less: Revenue from financing and other	(5,962)	(7,002)	(9,779)	(14,239)
Revenue from contracts with customers	430,339	412,357	826,880	746,344
Technology Segment [Member] | Telecom, Media & Entertainment [Member]
Disaggregation of Revenue [Abstract]
Net sales	115,784	96,927	227,976	153,579
Technology Segment [Member] | Technology [Member]
Disaggregation of Revenue [Abstract]
Net sales	53,752	76,321	122,892	146,288
Technology Segment [Member] | State and Local Government and Educational Institutions [Member]
Disaggregation of Revenue [Abstract]
Net sales	68,662	76,492	134,077	147,055
Technology Segment [Member] | Health Care [Member]
Disaggregation of Revenue [Abstract]
Net sales	88,237	59,252	142,925	105,788
Technology Segment [Member] | Financial Services [Member]
Disaggregation of Revenue [Abstract]
Net sales	37,036	46,732	67,047	94,153
Technology Segment [Member] | All Others [Member]
Disaggregation of Revenue [Abstract]
Net sales	72,830	63,635	141,742	113,720
Technology Segment [Member] | Cisco Systems [Member]
Disaggregation of Revenue [Abstract]
Net sales	174,072	173,166	340,974	301,098
Technology Segment [Member] | Dell / EMC [Member]
Disaggregation of Revenue [Abstract]
Net sales	43,498	15,349	69,838	46,430
Technology Segment [Member] | Juniper Networks [Member]
Disaggregation of Revenue [Abstract]
Net sales	18,438	24,716	43,152	38,295
Technology Segment [Member] | HP Inc. & HPE [Member]
Disaggregation of Revenue [Abstract]
Net sales	14,038	16,395	31,240	33,433
Technology Segment [Member] | Arista Networks [Member]
Disaggregation of Revenue [Abstract]
Net sales	8,047	13,443	19,545	20,263
Technology Segment [Member] | NetApp [Member]
Disaggregation of Revenue [Abstract]
Net sales	29,536	9,914	39,993	25,335
Technology Segment [Member] | All Others [Member]
Disaggregation of Revenue [Abstract]
Net sales	$ 148,672	$ 166,376	$ 291,917	$ 295,729