UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Net sales
Total	$ 427,604	$ 428,991	$ 1,215,716	$ 1,221,928
Cost of sales
Total	329,453	325,295	920,046	922,562
Gross profit	98,151	103,696	295,670	299,366
Selling, general, and administrative	65,390	73,090	201,746	209,400
Depreciation and amortization	3,143	3,647	10,000	10,667
Interest and financing costs	355	694	1,179	1,898
Operating expenses	68,888	77,431	212,925	221,965
Operating income	29,263	26,265	82,745	77,401
Other income (expense)	813	997	1,095	912
Earnings before tax	30,076	27,262	83,840	78,313
Provision for income taxes	8,438	7,712	24,996	22,477
Net earnings	$ 21,638	$ 19,550	$ 58,844	$ 55,836
Net earnings per common share-basic (in dollars per share)	$ 1.62	$ 1.47	$ 4.41	$ 4.19
Net earnings per common share-diluted (in dollars per share)	$ 1.62	$ 1.46	$ 4.39	$ 4.16
Weighted average common shares outstanding-basic (in shares)	13,332	13,320	13,342	13,329
Weighted average common shares outstanding-diluted (in shares)	13,378	13,378	13,402	13,410
Product [Member]
Net sales
Total	$ 375,512	$ 378,569	$ 1,066,408	$ 1,077,667
Cost of sales
Total	297,514	293,209	827,111	832,135
Services [Member]
Net sales
Total	52,092	50,422	149,308	144,261
Cost of sales
Total	$ 31,939	$ 32,086	$ 92,935	$ 90,427