SEGMENT REPORTING, Technology Segment Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Abstract]
Net sales	$ 411,565	$ 345,043	$ 792,937	$ 701,575
Financing and other	(3,133)	(5,086)	(7,987)	(10,491)
Revenue from contracts with customers	394,585	329,682	758,266	671,141
Technology Segment [Member]
Disaggregation of Revenue [Abstract]
Net sales	397,718	334,768	766,253	681,632
Financing and other	(3,133)	(5,086)	(7,987)	(10,491)
Revenue from contracts with customers	394,585	329,682	758,266	671,141
Technology Segment [Member] | Technology [Member]
Disaggregation of Revenue [Abstract]
Net sales	97,502	75,417	173,682	158,234
Technology Segment [Member] | Telecom, Media & Entertainment [Member]
Disaggregation of Revenue [Abstract]
Net sales	71,044	39,412	133,510	86,280
Technology Segment [Member] | Financial Services [Member]
Disaggregation of Revenue [Abstract]
Net sales	44,605	47,412	92,847	92,638
Technology Segment [Member] | SLED [Member]
Disaggregation of Revenue [Abstract]
Net sales	71,866	61,391	143,057	129,596
Technology Segment [Member] | Health Care [Member]
Disaggregation of Revenue [Abstract]
Net sales	59,818	51,081	115,926	97,531
Technology Segment [Member] | All others [Member]
Disaggregation of Revenue [Abstract]
Net sales	52,883	60,055	107,231	117,353
Technology Segment [Member] | Cisco Systems [Member]
Disaggregation of Revenue [Abstract]
Net sales	172,605	152,063	318,786	291,300
Technology Segment [Member] | NetApp [Member]
Disaggregation of Revenue [Abstract]
Net sales	9,771	9,477	23,198	25,039
Technology Segment [Member] | HP Inc. & HPE [Member]
Disaggregation of Revenue [Abstract]
Net sales	18,986	16,658	42,099	36,977
Technology Segment [Member] | Dell / EMC [Member]
Disaggregation of Revenue [Abstract]
Net sales	12,494	19,895	26,275	32,398
Technology Segment [Member] | Arista Networks [Member]
Disaggregation of Revenue [Abstract]
Net sales	26,766	10,673	47,716	30,471
Technology Segment [Member] | Juniper Networks [Member]
Disaggregation of Revenue [Abstract]
Net sales	24,370	11,262	31,424	21,660
Technology Segment [Member] | All others [Member]
Disaggregation of Revenue [Abstract]
Net sales	$ 132,726	$ 114,740	$ 276,755	$ 243,787