SEGMENT REPORTING, Reportable Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) Segment	Sep. 30, 2023 USD ($)
SEGMENT REPORTING [Abstract]
Number of business segments | Segment			4
Reportable Segment Information [Abstract]
Net sales	$ 515,172	$ 587,611	$ 1,059,710	$ 1,161,786
Gross profit	147,991	144,365	282,472	286,638
Operating expenses	105,273	99,502	204,285	195,443
Operating income	42,718	44,863	78,187	91,195
Other income (expense), net	579	117	2,652	307
Earnings before tax	43,297	44,980	80,839	91,502
Depreciation and amortization	5,765	5,630	10,584	10,422
Interest and financing costs	537	1,220	1,122	2,071
Selected Financial Data - Statement of Cash Flow [Abstract]
Purchases of property, equipment, and operating lease equipment	1,291	1,910	3,258	5,608
Technology Segment [Member]
Reportable Segment Information [Abstract]
Net sales	493,280	571,939	1,028,781	1,137,624
Product Segment [Member]
Reportable Segment Information [Abstract]
Net sales	389,613	500,937	846,925	999,103
Professional Services Segment [Member]
Reportable Segment Information [Abstract]
Net sales	61,900	38,270	99,179	73,826
Managed Services Segment [Member]
Reportable Segment Information [Abstract]
Net sales	41,767	32,732	82,677	64,695
Financing Segment [Member]
Reportable Segment Information [Abstract]
Net sales	21,892	15,672	30,929	24,162
Operating Segments [Member] | Technology Segment [Member]
Reportable Segment Information [Abstract]
Operating expenses	99,815	94,856	194,718	187,270
Operating income	27,466	35,883	59,357	79,381
Depreciation and amortization	5,765	5,602	10,584	10,366
Interest and financing costs	0	661	0	1,211
Selected Financial Data - Statement of Cash Flow [Abstract]
Purchases of property, equipment, and operating lease equipment	1,291	1,904	1,871	4,689
Operating Segments [Member] | Product Segment [Member]
Reportable Segment Information [Abstract]
Net sales	389,613	500,937	846,925	999,103
Gross profit	89,359	104,749	187,864	216,140
Operating Segments [Member] | Professional Services Segment [Member]
Reportable Segment Information [Abstract]
Net sales	61,900	38,270	99,179	73,826
Gross profit	25,583	15,796	41,038	30,520
Operating Segments [Member] | Managed Services Segment [Member]
Reportable Segment Information [Abstract]
Net sales	41,767	32,732	82,677	64,695
Gross profit	12,339	10,194	25,173	19,991
Operating Segments [Member] | Financing Segment [Member]
Reportable Segment Information [Abstract]
Net sales	21,892	15,672	30,929	24,162
Gross profit	20,710	13,626	28,397	19,987
Operating expenses	5,458	4,646	9,567	8,173
Operating income	15,252	8,980	18,830	11,814
Depreciation and amortization	0	28	0	56
Interest and financing costs	537	559	1,122	860
Selected Financial Data - Statement of Cash Flow [Abstract]
Purchases of property, equipment, and operating lease equipment	$ 0	$ 6	$ 1,387	$ 919