SEGMENT REPORTING, Technology Segment Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Abstract]
Net sales	$ 1,568,323	$ 1,588,404	$ 1,372,673
Less: Revenue from financing and other	(71,850)	(69,308)	(60,691)
Revenue from contracts with customers	1,496,473	1,519,096	1,311,982
Technology Segment [Member]
Disaggregation of Revenue [Abstract]
Net sales	1,507,954	1,530,138	1,329,520
Less: Revenue from financing and other	(23,850)	(15,631)	(21,115)
Revenue from contracts with customers	1,484,104	1,514,507	1,308,405
Technology Segment [Member] | Technology [Member]
Disaggregation of Revenue [Abstract]
Net sales	251,683	324,239	293,362
Technology Segment [Member] | Telecom, Media & Entertainment [Member]
Disaggregation of Revenue [Abstract]
Net sales	371,913	289,958	175,260
Technology Segment [Member] | Financial Services [Member]
Disaggregation of Revenue [Abstract]
Net sales	198,761	191,679	202,074
Technology Segment [Member] | State and Local Government and Educational Institutions [Member]
Disaggregation of Revenue [Abstract]
Net sales	245,919	243,092	223,330
Technology Segment [Member] | Health Care [Member]
Disaggregation of Revenue [Abstract]
Net sales	200,067	233,894	193,754
Technology Segment [Member] | All others [Member]
Disaggregation of Revenue [Abstract]
Net sales	239,611	247,276	241,740
Technology Segment [Member] | Cisco Systems [Member]
Disaggregation of Revenue [Abstract]
Net sales	537,041	607,719	556,182
Technology Segment [Member] | NetApp [Member]
Disaggregation of Revenue [Abstract]
Net sales	58,020	59,812	48,858
Technology Segment [Member] | HP Inc. & HPE [Member]
Disaggregation of Revenue [Abstract]
Net sales	59,838	71,802	74,348
Technology Segment [Member] | Dell / EMC [Member]
Disaggregation of Revenue [Abstract]
Net sales	107,336	84,939	61,284
Technology Segment [Member] | Arista Networks [Member]
Disaggregation of Revenue [Abstract]
Net sales	51,789	75,281	57,850
Technology Segment [Member] | Juniper Networks [Member]
Disaggregation of Revenue [Abstract]
Net sales	91,946	68,339	48,943
Technology Segment [Member] | All others [Member]
Disaggregation of Revenue [Abstract]
Net sales	$ 601,984	$ 562,246	$ 482,055