SEGMENT REPORTING, Reportable Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) Segment	Sep. 30, 2022 USD ($)
SEGMENT REPORTING [Abstract]
Number of business segments | Segment			4
Reportable Segment Information [Abstract]
Net sales	$ 587,611	$ 493,706	$ 1,161,786	$ 952,065
Gross profit	144,365	133,304	286,638	246,827
Operating expenses	99,502	89,197	195,443	169,537
Operating income	44,863	44,107	91,195	77,290
Other income (expense), net	117	(3,866)	307	(6,019)
Earnings before tax	44,980	40,241	91,502	71,271
Depreciation and amortization	5,630	3,568	10,422	6,778
Interest and financing costs	1,220	925	2,071	1,288
Selected Financial Data - Statement of Cash Flow [Abstract]
Purchases of property, equipment and operating lease equipment	1,910	633	5,608	2,410
Technology Segment [Member]
Reportable Segment Information [Abstract]
Net sales	571,939	471,478	1,137,624	920,263
Product Segment [Member]
Reportable Segment Information [Abstract]
Net sales	500,937	406,317	999,103	791,993
Professional Services Segment [Member]
Reportable Segment Information [Abstract]
Net sales	38,270	38,050	73,826	75,218
Managed Services Segment [Member]
Reportable Segment Information [Abstract]
Net sales	32,732	27,111	64,695	53,052
Financing Segment [Member]
Reportable Segment Information [Abstract]
Net sales	15,672	22,228	24,162	31,802
Operating Segments [Member] | Technology Segment [Member]
Reportable Segment Information [Abstract]
Operating expenses	94,856	84,372	187,270	160,804
Operating income	35,883	31,903	79,381	61,122
Depreciation and amortization	5,602	3,540	10,366	6,722
Interest and financing costs	661	671	1,211	809
Selected Financial Data - Statement of Cash Flow [Abstract]
Purchases of property, equipment and operating lease equipment	1,904	611	4,689	1,897
Operating Segments [Member] | Product Segment [Member]
Reportable Segment Information [Abstract]
Net sales	500,937	406,317	999,103	791,993
Gross profit	104,749	94,389	216,140	177,557
Operating Segments [Member] | Professional Services Segment [Member]
Reportable Segment Information [Abstract]
Net sales	38,270	38,050	73,826	75,218
Gross profit	15,796	14,697	30,520	29,752
Operating Segments [Member] | Managed Services Segment [Member]
Reportable Segment Information [Abstract]
Net sales	32,732	27,111	64,695	53,052
Gross profit	10,194	7,189	19,991	14,617
Operating Segments [Member] | Financing Segment [Member]
Reportable Segment Information [Abstract]
Net sales	15,672	22,228	24,162	31,802
Gross profit	13,626	17,029	19,987	24,901
Operating expenses	4,646	4,825	8,173	8,733
Operating income	8,980	12,204	11,814	16,168
Depreciation and amortization	28	28	56	56
Interest and financing costs	559	254	860	479
Selected Financial Data - Statement of Cash Flow [Abstract]
Purchases of property, equipment and operating lease equipment	$ 6	$ 22	$ 919	$ 513