SEGMENT REPORTING, Technology Segment Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Abstract]
Net sales	$ 416,649	$ 355,031
Less: Revenue from financing and other	(14,690)	(20,084)
Revenue from contracts with customers	401,959	334,947
Technology Segment [Member]
Disaggregation of Revenue [Abstract]
Net sales	400,358	341,224
Less: Revenue from financing and other	(3,817)	(7,237)
Revenue from contracts with customers	396,541	333,987
Technology Segment [Member] | Telecom, Media & Entertainment [Member]
Disaggregation of Revenue [Abstract]
Net sales	112,192	56,652
Technology Segment [Member] | Technology [Member]
Disaggregation of Revenue [Abstract]
Net sales	69,140	69,967
Technology Segment [Member] | State and Local Government and Educational Institutions [Member]
Disaggregation of Revenue [Abstract]
Net sales	65,415	70,563
Technology Segment [Member] | Health Care [Member]
Disaggregation of Revenue [Abstract]
Net sales	54,688	46,535
Technology Segment [Member] | Financial Services [Member]
Disaggregation of Revenue [Abstract]
Net sales	30,011	47,421
Technology Segment [Member] | All others [Member]
Disaggregation of Revenue [Abstract]
Net sales	68,912	50,086
Technology Segment [Member] | Cisco Systems [Member]
Disaggregation of Revenue [Abstract]
Net sales	166,902	127,932
Technology Segment [Member] | Dell / EMC [Member]
Disaggregation of Revenue [Abstract]
Net sales	26,340	31,081
Technology Segment [Member] | Juniper Networks [Member]
Disaggregation of Revenue [Abstract]
Net sales	24,714	13,579
Technology Segment [Member] | HP Inc. & HPE [Member]
Disaggregation of Revenue [Abstract]
Net sales	17,202	17,038
Technology Segment [Member] | Arista Networks [Member]
Disaggregation of Revenue [Abstract]
Net sales	11,498	6,820
Technology Segment [Member] | NetApp [Member]
Disaggregation of Revenue [Abstract]
Net sales	10,457	15,421
Technology Segment [Member] | All others [Member]
Disaggregation of Revenue [Abstract]
Net sales	$ 143,245	$ 129,353