SEGMENT REPORTING, Reportable Segment Information (Details) $ in Thousands	12 Months Ended
	Mar. 31, 2022 USD ($) Segment	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)
SEGMENT REPORTING [Abstract]
Number of business segment | Segment	2
Reportable Segment Information [Abstract]
Net sales	$ 1,821,019	$ 1,568,323	$ 1,588,404
Cost of Sales [Abstract]
Cost of sales	1,360,037	1,174,769	1,197,213
Gross profit	460,982	393,554	391,191
Selling, general, and administrative expenses	297,117	271,263	279,182
Depreciation and amortization	14,646	13,951	14,156
Interest and financing costs	1,903	2,005	2,574
Operating expenses	313,666	287,219	295,912
Operating income	147,316	106,335	95,279
Other income	(432)	571	680
Earnings before tax	146,884	106,906	95,959
Net Sales [Abstract]
Contracts with customers	1,752,935	1,496,473	1,519,096
Financing and other	68,084	71,850	69,308
Net sales	1,821,019	1,568,323	1,588,404
Selected Financial Data - Statement of Cash Flow [Abstract]
Depreciation and amortization	24,305	19,991	19,156
Purchases of property, equipment and operating lease equipment	23,182	11,513	7,009
Selected Financial Data - Balance Sheet [Abstract]
Total assets	1,166,203	1,076,775	909,113
Product [Member]
Reportable Segment Information [Abstract]
Net sales	1,580,394	1,366,158	1,395,288
Cost of Sales [Abstract]
Cost of sales	1,210,943	1,049,677	1,076,773
Net Sales [Abstract]
Net sales	1,580,394	1,366,158	1,395,288
Service [Member]
Reportable Segment Information [Abstract]
Net sales	240,625	202,165	193,116
Cost of Sales [Abstract]
Cost of sales	149,094	125,092	120,440
Net Sales [Abstract]
Net sales	240,625	202,165	193,116
Technology Segment [Member]
Reportable Segment Information [Abstract]
Net sales	1,733,036	1,507,954	1,530,138
Net Sales [Abstract]
Contracts with customers	1,718,093	1,484,104	1,514,507
Financing and other	14,943	23,850	15,631
Net sales	1,733,036	1,507,954	1,530,138
Operating Segments [Member] | Technology Segment [Member]
Reportable Segment Information [Abstract]
Net sales	1,733,036	1,507,954	1,530,138
Cost of Sales [Abstract]
Cost of sales	1,324,883	1,161,719	1,189,550
Gross profit	408,153	346,235	340,588
Selling, general, and administrative expenses	283,690	256,210	264,123
Depreciation and amortization	14,535	13,839	14,016
Interest and financing costs	928	521	294
Operating expenses	299,153	270,570	278,433
Operating income	109,000	75,665	62,155
Net Sales [Abstract]
Contracts with customers	1,718,093	1,484,104	1,514,507
Financing and other	14,943	23,850	15,631
Net sales	1,733,036	1,507,954	1,530,138
Selected Financial Data - Statement of Cash Flow [Abstract]
Depreciation and amortization	15,592	14,568	14,516
Purchases of property, equipment and operating lease equipment	4,951	4,752	4,842
Selected Financial Data - Balance Sheet [Abstract]
Total assets	941,743	828,576	709,854
Operating Segments [Member] | Technology Segment [Member] | Product [Member]
Reportable Segment Information [Abstract]
Net sales	1,492,411	1,305,789	1,337,022
Cost of Sales [Abstract]
Cost of sales	1,175,789	1,036,627	1,069,110
Net Sales [Abstract]
Net sales	1,492,411	1,305,789	1,337,022
Operating Segments [Member] | Technology Segment [Member] | Service [Member]
Reportable Segment Information [Abstract]
Net sales	240,625	202,165	193,116
Cost of Sales [Abstract]
Cost of sales	149,094	125,092	120,440
Net Sales [Abstract]
Net sales	240,625	202,165	193,116
Operating Segments [Member] | Financing Segment [Member]
Reportable Segment Information [Abstract]
Net sales	87,983	60,369	58,266
Cost of Sales [Abstract]
Cost of sales	35,154	13,050	7,663
Gross profit	52,829	47,319	50,603
Selling, general, and administrative expenses	13,427	15,053	15,059
Depreciation and amortization	111	112	140
Interest and financing costs	975	1,484	2,280
Operating expenses	14,513	16,649	17,479
Operating income	38,316	30,670	33,124
Net Sales [Abstract]
Contracts with customers	34,842	12,369	4,589
Financing and other	53,141	48,000	53,677
Net sales	87,983	60,369	58,266
Selected Financial Data - Statement of Cash Flow [Abstract]
Depreciation and amortization	8,713	5,423	4,640
Purchases of property, equipment and operating lease equipment	18,231	6,761	2,167
Selected Financial Data - Balance Sheet [Abstract]
Total assets	224,460	248,199	199,259
Operating Segments [Member] | Financing Segment [Member] | Product [Member]
Reportable Segment Information [Abstract]
Net sales	87,983	60,369	58,266
Cost of Sales [Abstract]
Cost of sales	35,154	13,050	7,663
Net Sales [Abstract]
Net sales	87,983	60,369	58,266
Operating Segments [Member] | Financing Segment [Member] | Service [Member]
Reportable Segment Information [Abstract]
Net sales	0	0	0
Cost of Sales [Abstract]
Cost of sales	0	0	0
Net Sales [Abstract]
Net sales	$ 0	$ 0	$ 0