SEGMENT REPORTING, Reportable Segment Information (Details) $ in Thousands	12 Months Ended
	Mar. 31, 2023 USD ($) Segment	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)
SEGMENT REPORTING [Abstract]
Number of business segment | Segment	2
Reportable Segment Information [Abstract]
Net sales	$ 2,067,718	$ 1,821,019	$ 1,568,323
Cost of Sales [Abstract]
Cost of sales	1,550,194	1,360,037	1,174,769
Gross profit	517,524	460,982	393,554
Selling, general, and administrative expenses	333,520	297,117	271,263
Depreciation and amortization	13,709	14,646	13,951
Interest and financing costs	4,133	1,903	2,005
Operating expenses	351,362	313,666	287,219
Operating income	166,162	147,316	106,335
Other income (expense), net	(3,188)	(432)	571
Earnings before tax	162,974	146,884	106,906
Net Sales [Abstract]
Contracts with customers	2,001,872	1,752,935	1,496,473
Financing and other	65,846	68,084	71,850
Net sales	2,067,718	1,821,019	1,568,323
Selected Financial Data - Statement of Cash Flow [Abstract]
Depreciation and amortization	18,589	24,305	19,991
Purchases of property, equipment and operating lease equipment	9,380	23,182	11,513
Selected Financial Data - Balance Sheet [Abstract]
Total assets	1,414,826	1,166,203	1,076,775
Product [Member]
Reportable Segment Information [Abstract]
Net sales	1,803,275	1,580,394	1,366,158
Cost of Sales [Abstract]
Cost of sales	1,379,500	1,210,943	1,049,677
Net Sales [Abstract]
Net sales	1,803,275	1,580,394	1,366,158
Service [Member]
Reportable Segment Information [Abstract]
Net sales	264,443	240,625	202,165
Cost of Sales [Abstract]
Cost of sales	170,694	149,094	125,092
Net Sales [Abstract]
Net sales	264,443	240,625	202,165
Technology Segment [Member]
Reportable Segment Information [Abstract]
Net sales	2,015,245	1,733,036	1,507,954
Net Sales [Abstract]
Contracts with customers	1,992,568	1,718,093	1,484,104
Financing and other	22,677	14,943	23,850
Net sales	2,015,245	1,733,036	1,507,954
Technology Segment [Member] | Service [Member]
Reportable Segment Information [Abstract]
Net sales	264,443	240,625	202,165
Net Sales [Abstract]
Net sales	264,443	240,625	202,165
Operating Segments [Member] | Technology Segment [Member]
Reportable Segment Information [Abstract]
Net sales	2,015,245	1,733,036	1,507,954
Cost of Sales [Abstract]
Cost of sales	1,540,755	1,324,883	1,161,719
Gross profit	474,490	408,153	346,235
Selling, general, and administrative expenses	317,885	283,690	256,210
Depreciation and amortization	13,598	14,535	13,839
Interest and financing costs	2,897	928	521
Operating expenses	334,380	299,153	270,570
Operating income	140,110	109,000	75,665
Net Sales [Abstract]
Contracts with customers	1,992,568	1,718,093	1,484,104
Financing and other	22,677	14,943	23,850
Net sales	2,015,245	1,733,036	1,507,954
Selected Financial Data - Statement of Cash Flow [Abstract]
Depreciation and amortization	14,999	15,592	14,568
Purchases of property, equipment and operating lease equipment	7,693	4,951	4,752
Selected Financial Data - Balance Sheet [Abstract]
Total assets	1,147,821	941,743	828,576
Operating Segments [Member] | Technology Segment [Member] | Product [Member]
Reportable Segment Information [Abstract]
Net sales	1,750,802	1,492,411	1,305,789
Cost of Sales [Abstract]
Cost of sales	1,370,061	1,175,789	1,036,627
Net Sales [Abstract]
Net sales	1,750,802	1,492,411	1,305,789
Operating Segments [Member] | Technology Segment [Member] | Service [Member]
Reportable Segment Information [Abstract]
Net sales	264,443	240,625	202,165
Cost of Sales [Abstract]
Cost of sales	170,694	149,094	125,092
Net Sales [Abstract]
Net sales	264,443	240,625	202,165
Operating Segments [Member] | Financing Segment [Member]
Reportable Segment Information [Abstract]
Net sales	52,473	87,983	60,369
Cost of Sales [Abstract]
Cost of sales	9,439	35,154	13,050
Gross profit	43,034	52,829	47,319
Selling, general, and administrative expenses	15,635	13,427	15,053
Depreciation and amortization	111	111	112
Interest and financing costs	1,236	975	1,484
Operating expenses	16,982	14,513	16,649
Operating income	26,052	38,316	30,670
Net Sales [Abstract]
Contracts with customers	9,304	34,842	12,369
Financing and other	43,169	53,141	48,000
Net sales	52,473	87,983	60,369
Selected Financial Data - Statement of Cash Flow [Abstract]
Depreciation and amortization	3,590	8,713	5,423
Purchases of property, equipment and operating lease equipment	1,687	18,231	6,761
Selected Financial Data - Balance Sheet [Abstract]
Total assets	267,005	224,460	248,199
Operating Segments [Member] | Financing Segment [Member] | Product [Member]
Reportable Segment Information [Abstract]
Net sales	52,473	87,983	60,369
Cost of Sales [Abstract]
Cost of sales	9,439	35,154	13,050
Net Sales [Abstract]
Net sales	52,473	87,983	60,369
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