UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net sales
Total	$ 458,017	$ 433,081	$ 874,666	$ 788,112
Cost of sales
Total	335,015	334,119	646,152	590,593
Gross profit	123,002	98,962	228,514	197,519
Selling, general, and administrative	74,504	66,889	143,279	136,356
Depreciation and amortization	3,853	3,341	7,779	6,857
Interest and financing costs	342	247	701	824
Operating expenses	78,699	70,477	151,759	144,037
Operating income	44,303	28,485	76,755	53,482
Other income (expense)	(325)	184	(202)	282
Earnings before tax	43,978	28,669	76,553	53,764
Provision for income taxes	12,565	8,823	21,622	16,558
Net earnings	$ 31,413	$ 19,846	$ 54,931	$ 37,206
Net earnings per common share-basic (in dollars per share)	$ 2.36	$ 1.48	$ 4.12	$ 2.79
Net earnings per common share-diluted (in dollars per share)	$ 2.34	$ 1.48	$ 4.09	$ 2.78
Weighted average common shares outstanding-basic (in shares)	13,332	13,372	13,333	13,347
Weighted average common shares outstanding-diluted (in shares)	13,432	13,391	13,431	13,394
Product [Member]
Net sales
Total	$ 397,160	$ 383,656	$ 758,217	$ 690,896
Cost of sales
Total	297,629	302,963	574,856	529,597
Services [Member]
Net sales
Total	60,857	49,425	116,449	97,216
Cost of sales
Total	$ 37,386	$ 31,156	$ 71,296	$ 60,996