SEGMENT REPORTING, Technology Segment Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Abstract]
Net sales	$ 427,604	$ 428,991	$ 1,215,716	$ 1,221,928
Less: Revenue from financing and other	(14,525)	(22,384)	(54,305)	(54,855)
Revenue from contracts with customers	413,079	406,607	1,161,411	1,167,073
Technology Segment [Member]
Disaggregation of Revenue [Abstract]
Net sales	415,570	410,628	1,176,153	1,176,881
Less: Revenue from financing and other	(4,395)	(5,710)	(18,634)	(13,697)
Revenue from contracts with customers	411,175	404,918	1,157,519	1,163,184
Technology Segment [Member] | Technology [Member]
Disaggregation of Revenue [Abstract]
Net sales	57,346	77,841	203,634	251,523
Technology Segment [Member] | Telecom, Media & Entertainment [Member]
Disaggregation of Revenue [Abstract]
Net sales	123,441	84,707	277,020	218,217
Technology Segment [Member] | Financial Services [Member]
Disaggregation of Revenue [Abstract]
Net sales	60,610	56,395	154,763	149,241
Technology Segment [Member] | State and Local Government and Educational Institutions [Member]
Disaggregation of Revenue [Abstract]
Net sales	50,703	55,908	197,758	198,964
Technology Segment [Member] | Health Care [Member]
Disaggregation of Revenue [Abstract]
Net sales	44,706	60,275	150,494	176,202
Technology Segment [Member] | All others [Member]
Disaggregation of Revenue [Abstract]
Net sales	78,764	75,502	192,484	182,734
Technology Segment [Member] | Cisco Systems [Member]
Disaggregation of Revenue [Abstract]
Net sales	132,290	169,265	433,388	488,051
Technology Segment [Member] | NetApp [Member]
Disaggregation of Revenue [Abstract]
Net sales	13,861	15,799	39,196	38,997
Technology Segment [Member] | HP Inc. & HPE [Member]
Disaggregation of Revenue [Abstract]
Net sales	14,100	15,853	47,533	57,952
Technology Segment [Member] | Dell / EMC [Member]
Disaggregation of Revenue [Abstract]
Net sales	34,027	12,025	80,457	38,300
Technology Segment [Member] | Arista Networks [Member]
Disaggregation of Revenue [Abstract]
Net sales	22,157	12,862	42,420	60,578
Technology Segment [Member] | Juniper Networks [Member]
Disaggregation of Revenue [Abstract]
Net sales	29,781	27,419	68,076	58,843
Technology Segment [Member] | All others [Member]
Disaggregation of Revenue [Abstract]
Net sales	$ 169,354	$ 157,405	$ 465,083	$ 434,160