SEGMENT REPORTING, Technology Segment Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Abstract]
Net sales	$ 2,067,718	$ 1,821,019	$ 1,568,323
Less: Revenue from financing and other	(65,846)	(68,084)	(71,850)
Revenue from contracts with customers	2,001,872	1,752,935	1,496,473
Product [Member]
Disaggregation of Revenue [Abstract]
Net sales	1,803,275	1,580,394	1,366,158
ePlus Services [Member]
Disaggregation of Revenue [Abstract]
Net sales	264,443	240,625	202,165
Technology Segment [Member]
Disaggregation of Revenue [Abstract]
Net sales	2,015,245	1,733,036	1,507,954
Less: Revenue from financing and other	(22,677)	(14,943)	(23,850)
Revenue from contracts with customers	1,992,568	1,718,093	1,484,104
Technology Segment [Member] | Transferred at Point in Time [Member] | Sales Channel, Directly to Consumer [Member]
Disaggregation of Revenue [Abstract]
Revenue from contracts with customers	1,566,760	1,342,799	1,174,582
Technology Segment [Member] | Transferred at Point in Time [Member] | Sales Channel, Through Intermediary [Member]
Disaggregation of Revenue [Abstract]
Revenue from contracts with customers	161,365	134,669	107,357
Technology Segment [Member] | Transferred over Time [Member] | Sales Channel, Directly to Consumer [Member]
Disaggregation of Revenue [Abstract]
Revenue from contracts with customers	264,443	240,625	202,165
Technology Segment [Member] | Data Center / Cloud [Member]
Disaggregation of Revenue [Abstract]
Net sales	587,097	581,113	516,930
Technology Segment [Member] | Networking [Member]
Disaggregation of Revenue [Abstract]
Net sales	803,678	611,488	510,205
Technology Segment [Member] | Security [Member]
Disaggregation of Revenue [Abstract]
Net sales	214,459	158,927	155,186
Technology Segment [Member] | Collaboration [Member]
Disaggregation of Revenue [Abstract]
Net sales	57,472	57,244	47,504
Technology Segment [Member] | Other [Member]
Disaggregation of Revenue [Abstract]
Net sales	88,096	83,639	75,964
Technology Segment [Member] | ePlus Services [Member]
Disaggregation of Revenue [Abstract]
Net sales	264,443	240,625	202,165
Technology Segment [Member] | Telecom, Media & Entertainment [Member]
Disaggregation of Revenue [Abstract]
Net sales	532,921	502,408	371,913
Technology Segment [Member] | Technology [Member]
Disaggregation of Revenue [Abstract]
Net sales	393,594	250,485	251,683
Technology Segment [Member] | State and Local Government and Educational Institutions [Member]
Disaggregation of Revenue [Abstract]
Net sales	290,624	241,769	245,919
Technology Segment [Member] | Health Care [Member]
Disaggregation of Revenue [Abstract]
Net sales	274,936	270,481	200,067
Technology Segment [Member] | Financial Services [Member]
Disaggregation of Revenue [Abstract]
Net sales	156,257	155,160	198,761
Technology Segment [Member] | All others [Member]
Disaggregation of Revenue [Abstract]
Net sales	$ 366,913	$ 312,733	$ 239,611