SEGMENT REPORTING, Technology Segment Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Abstract]
Net sales	$ 345,043	$ 371,363	$ 701,575	$ 744,719
Financing and other	(14,301)	(13,604)	(28,778)	(24,784)
Revenue from contracts with customers	330,742	357,759	672,797	719,935
Technology Segment [Member]
Disaggregation of Revenue [Abstract]
Net sales	334,768	358,678	681,632	721,577
Financing and other	(5,086)	(5,835)	(10,491)	(9,373)
Revenue from contracts with customers	329,682	352,843	671,141	712,204
Technology Segment [Member] | Technology [Member]
Disaggregation of Revenue [Abstract]
Net sales	75,417	91,401	158,234	180,755
Technology Segment [Member] | Telecom, Media & Entertainment [Member]
Disaggregation of Revenue [Abstract]
Net sales	39,412	49,508	86,280	106,913
Technology Segment [Member] | Financial Services [Member]
Disaggregation of Revenue [Abstract]
Net sales	47,412	52,507	92,638	90,798
Technology Segment [Member] | SLED [Member]
Disaggregation of Revenue [Abstract]
Net sales	61,391	66,493	129,596	143,656
Technology Segment [Member] | Health Care [Member]
Disaggregation of Revenue [Abstract]
Net sales	51,081	44,372	97,531	90,857
Technology Segment [Member] | All others [Member]
Disaggregation of Revenue [Abstract]
Net sales	60,055	54,397	117,353	108,598
Technology Segment [Member] | Cisco Systems [Member]
Disaggregation of Revenue [Abstract]
Net sales	152,063	165,690	291,300	339,035
Technology Segment [Member] | NetApp [Member]
Disaggregation of Revenue [Abstract]
Net sales	9,477	10,433	25,039	25,887
Technology Segment [Member] | HP Inc. & HPE [Member]
Disaggregation of Revenue [Abstract]
Net sales	16,658	28,377	36,977	56,648
Technology Segment [Member] | Dell / EMC [Member]
Disaggregation of Revenue [Abstract]
Net sales	19,895	17,485	32,398	30,898
Technology Segment [Member] | Arista Networks [Member]
Disaggregation of Revenue [Abstract]
Net sales	10,673	7,153	30,471	24,527
Technology Segment [Member] | Juniper [Member]
Disaggregation of Revenue [Abstract]
Net sales	11,262	14,240	21,660	23,576
Technology Segment [Member] | All others [Member]
Disaggregation of Revenue [Abstract]
Net sales	$ 114,740	$ 115,300	$ 243,787	$ 221,006