SEGMENT REPORTING, Reportable Segment Information (Details) $ in Thousands	12 Months Ended
	Mar. 31, 2024 USD ($) Segment	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)
SEGMENT REPORTING [Abstract]
Number of business segment | Segment	4
Reportable Segment Information [Abstract]
Net sales	$ 2,225,302	$ 2,067,718	$ 1,821,019
Gross profit	550,793	517,524	460,982
Operating expenses	392,536	351,362	313,666
Operating income	158,257	166,162	147,316
Other income (expense), net	2,836	(3,188)	(432)
Earnings before tax	161,093	162,974	146,884
Depreciation and amortization	21,025	13,709	14,646
Interest and financing costs	3,777	4,133	1,903
Selected Financial Data - Statement of Cash Flow [Abstract]
Purchases of property, equipment and operating lease equipment	8,503	9,380	23,182
Technology Segment [Member]
Reportable Segment Information [Abstract]
Net sales	2,175,886	2,015,245	1,733,036
Product Segment [Member]
Reportable Segment Information [Abstract]
Net sales	1,883,809	1,750,802	1,492,411
Professional Services Segment [Member]
Reportable Segment Information [Abstract]
Net sales	154,549	151,785	146,747
Managed Services Segment [Member]
Reportable Segment Information [Abstract]
Net sales	137,528	112,658	93,878
Financing Segment [Member]
Reportable Segment Information [Abstract]
Net sales	49,416	52,473	87,983
Operating Segments [Member] | Technology Segment [Member]
Reportable Segment Information [Abstract]
Operating expenses	375,919	334,380	299,153
Operating income	132,560	140,110	109,000
Depreciation and amortization	20,951	13,598	14,535
Interest and financing costs	1,428	2,897	928
Selected Financial Data - Statement of Cash Flow [Abstract]
Purchases of property, equipment and operating lease equipment	7,454	7,693	4,951
Operating Segments [Member] | Product Segment [Member]
Reportable Segment Information [Abstract]
Net sales	1,883,809	1,750,802	1,492,411
Gross profit	397,618	380,741	316,622
Operating Segments [Member] | Professional Services Segment [Member]
Reportable Segment Information [Abstract]
Net sales	154,549	151,785	146,747
Gross profit	68,194	61,594	63,384
Operating Segments [Member] | Managed Services Segment [Member]
Reportable Segment Information [Abstract]
Net sales	137,528	112,658	93,878
Gross profit	42,667	32,155	28,147
Operating Segments [Member] | Financing Segment [Member]
Reportable Segment Information [Abstract]
Net sales	49,416	52,473	87,983
Gross profit	42,314	43,034	52,829
Operating expenses	16,617	16,982	14,513
Operating income	25,697	26,052	38,316
Depreciation and amortization	74	111	111
Interest and financing costs	2,349	1,236	975
Selected Financial Data - Statement of Cash Flow [Abstract]
Purchases of property, equipment and operating lease equipment	$ 1,049	$ 1,687	$ 18,231