SEGMENT REPORTING, Technology Segment Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Abstract]
Net sales	$ 381,372	$ 356,532
Financing and other	(4,854)	(5,405)
Revenue from contracts with customers	363,681	341,459
Technology Segment [Member]
Disaggregation of Revenue [Abstract]
Net sales	368,535	346,864
Financing and other	(4,854)	(5,405)
Revenue from contracts with customers	363,681	341,459
Technology Segment [Member] | Technology [Member]
Disaggregation of Revenue [Abstract]
Net sales	76,180	82,817
Technology Segment [Member] | Telecom, Media & Entertainment [Member]
Disaggregation of Revenue [Abstract]
Net sales	62,466	46,868
Technology Segment [Member] | Financial Services [Member]
Disaggregation of Revenue [Abstract]
Net sales	48,241	45,225
Technology Segment [Member] | SLED [Member]
Disaggregation of Revenue [Abstract]
Net sales	71,190	68,205
Technology Segment [Member] | Health Care [Member]
Disaggregation of Revenue [Abstract]
Net sales	56,109	46,450
Technology Segment [Member] | All others [Member]
Disaggregation of Revenue [Abstract]
Net sales	54,349	57,299
Technology Segment [Member] | Cisco Systems [Member]
Disaggregation of Revenue [Abstract]
Net sales	146,181	139,577
Technology Segment [Member] | NetApp [Member]
Disaggregation of Revenue [Abstract]
Net sales	13,427	15,020
Technology Segment [Member] | HP Inc. & HPE [Member]
Disaggregation of Revenue [Abstract]
Net sales	23,113	20,355
Technology Segment [Member] | Dell / EMC [Member]
Disaggregation of Revenue [Abstract]
Net sales	13,781	12,503
Technology Segment [Member] | Arista Networks [Member]
Disaggregation of Revenue [Abstract]
Net sales	20,950	19,844
Technology Segment [Member] | Juniper Networks [Member]
Disaggregation of Revenue [Abstract]
Net sales	7,054	10,431
Technology Segment [Member] | All others [Member]
Disaggregation of Revenue [Abstract]
Net sales	$ 144,029	$ 129,134