UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2021	Dec. 31, 2020
Net sales
Total	$ 494,834			$ 427,604			$ 1,369,500	$ 1,215,716
Cost of sales
Total	377,717			329,453			1,023,869	920,046
Gross profit	117,117			98,151			345,631	295,670
Selling, general, and administrative	76,874			65,390			220,153	201,746
Depreciation and amortization	3,597			3,143			11,376	10,000
Interest and financing costs	561			355			1,262	1,179
Operating expenses	81,032			68,888			232,791	212,925
Operating income	36,085			29,263			112,840	82,745
Other income (expense)	(175)			813			(377)	1,095
Earnings before tax	35,910			30,076			112,463	83,840
Provision for income taxes	9,486			8,438			31,108	24,996
Net earnings	$ 26,424	$ 31,413	$ 23,518	$ 21,638	$ 19,846	$ 17,360	$ 81,355	$ 58,844
Net earnings per common share-basic (in dollars per share)	$ 0.99			$ 0.81			$ 3.05	$ 2.21
Net earnings per common share-diluted (in dollars per share)	$ 0.98			$ 0.81			$ 3.03	$ 2.20
Weighted average common shares outstanding-basic (in shares)	26,668			26,664			26,666	26,684
Weighted average common shares outstanding-diluted (in shares)	26,930			26,756			26,887	26,804
Product [Member]
Net sales
Total	$ 432,307			$ 375,512			$ 1,190,524	$ 1,066,408
Cost of sales
Total	339,810			297,514			914,666	827,111
Services [Member]
Net sales
Total	62,527			52,092			178,976	149,308
Cost of sales
Total	$ 37,907			$ 31,939			$ 109,203	$ 92,935