SEGMENT REPORTING, Technology Segment Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Abstract]
Net sales	$ 433,081	$ 411,565	$ 788,112	$ 792,937
Less: Revenue from financing and other	(19,696)	(15,569)	(39,780)	(32,471)
Revenue from contracts with customers	413,385	395,996	748,332	760,466
Technology Segment [Member]
Disaggregation of Revenue [Abstract]
Net sales	419,359	397,718	760,583	766,253
Less: Revenue from financing and other	(7,002)	(3,133)	(14,239)	(7,987)
Revenue from contracts with customers	412,357	394,585	746,344	758,266
Technology Segment [Member] | Technology [Member]
Disaggregation of Revenue [Abstract]
Net sales	76,321	97,502	146,288	173,682
Technology Segment [Member] | Telecom, Media & Entertainment [Member]
Disaggregation of Revenue [Abstract]
Net sales	96,927	71,044	153,579	133,510
Technology Segment [Member] | Financial Services [Member]
Disaggregation of Revenue [Abstract]
Net sales	46,732	44,605	94,153	92,847
Technology Segment [Member] | State and Local Government and Educational Institutions [Member]
Disaggregation of Revenue [Abstract]
Net sales	76,492	71,866	147,055	143,057
Technology Segment [Member] | Health Care [Member]
Disaggregation of Revenue [Abstract]
Net sales	59,252	59,818	105,788	115,926
Technology Segment [Member] | All others [Member]
Disaggregation of Revenue [Abstract]
Net sales	63,635	52,883	113,720	107,231
Technology Segment [Member] | Cisco Systems [Member]
Disaggregation of Revenue [Abstract]
Net sales	173,166	172,605	301,098	318,786
Technology Segment [Member] | NetApp [Member]
Disaggregation of Revenue [Abstract]
Net sales	9,914	9,771	25,335	23,198
Technology Segment [Member] | HP Inc. & HPE [Member]
Disaggregation of Revenue [Abstract]
Net sales	16,395	18,986	33,433	42,099
Technology Segment [Member] | Dell / EMC [Member]
Disaggregation of Revenue [Abstract]
Net sales	15,349	12,494	46,430	26,275
Technology Segment [Member] | Arista Networks [Member]
Disaggregation of Revenue [Abstract]
Net sales	13,443	26,766	20,263	47,716
Technology Segment [Member] | Juniper Networks [Member]
Disaggregation of Revenue [Abstract]
Net sales	24,716	24,370	38,295	31,424
Technology Segment [Member] | All others [Member]
Disaggregation of Revenue [Abstract]
Net sales	$ 166,376	$ 132,726	$ 295,729	$ 276,755