SEGMENT REPORTING, Technology Segment Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Abstract]
Net sales	$ 366,476	$ 428,991	$ 411,565	$ 381,372	$ 325,434	$ 345,664	$ 345,043	$ 356,532	$ 1,588,404	$ 1,372,673	$ 1,418,802
Financing and other									(69,308)	(60,691)	(48,845)
Revenue from contracts with customers									1,519,096	1,311,982	1,369,957
Technology Segment [Member]
Disaggregation of Revenue [Abstract]
Net sales									1,530,138	1,329,520	1,372,765
Financing and other									(15,631)	(21,115)	(16,540)
Revenue from contracts with customers									1,514,507	1,308,405	1,356,225
Technology Segment [Member] | Technology [Member]
Disaggregation of Revenue [Abstract]
Net sales									324,239	293,362	330,241
Technology Segment [Member] | Telecom, Media & Entertainment [Member]
Disaggregation of Revenue [Abstract]
Net sales									289,958	175,260	194,292
Technology Segment [Member] | Financial Services [Member]
Disaggregation of Revenue [Abstract]
Net sales									191,679	202,074	201,712
Technology Segment [Member] | SLED [Member]
Disaggregation of Revenue [Abstract]
Net sales									243,092	223,330	234,141
Technology Segment [Member] | Health Care [Member]
Disaggregation of Revenue [Abstract]
Net sales									233,894	193,754	189,889
Technology Segment [Member] | All others [Member]
Disaggregation of Revenue [Abstract]
Net sales									247,276	241,740	222,490
Technology Segment [Member] | Cisco Systems [Member]
Disaggregation of Revenue [Abstract]
Net sales									607,719	556,182	582,419
Technology Segment [Member] | NetApp [Member]
Disaggregation of Revenue [Abstract]
Net sales									59,812	48,858	54,821
Technology Segment [Member] | HP Inc. & HPE [Member]
Disaggregation of Revenue [Abstract]
Net sales									71,802	74,348	86,675
Technology Segment [Member] | Dell / EMC [Member]
Disaggregation of Revenue [Abstract]
Net sales									84,939	61,284	54,294
Technology Segment [Member] | Arista Networks [Member]
Disaggregation of Revenue [Abstract]
Net sales									75,281	57,850	52,521
Technology Segment [Member] | Juniper Networks [Member]
Disaggregation of Revenue [Abstract]
Net sales									68,339	48,943	44,623
Technology Segment [Member] | All others [Member]
Disaggregation of Revenue [Abstract]
Net sales									$ 562,246	$ 482,055	$ 497,412