UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net sales
Total	$ 411,565	$ 345,043	$ 792,937	$ 701,575
Cost of sales
Total	308,534	259,543	597,267	535,372
Gross profit	103,031	85,500	195,670	166,203
Selling, general, and administrative	70,523	57,705	136,310	114,671
Depreciation and amortization	3,557	2,741	7,020	5,531
Interest and financing costs	576	484	1,204	960
Operating expenses	74,656	60,930	144,534	121,162
Operating income	28,375	24,570	51,136	45,041
Other income (expense)	(40)	322	(85)	419
Earnings before tax	28,335	24,892	51,051	45,460
Provision for income taxes	8,237	6,889	14,765	12,184
Net earnings	$ 20,098	$ 18,003	$ 36,286	$ 33,276
Net earnings per common share-basic (in dollars per share)	$ 1.51	$ 1.33	$ 2.72	$ 2.47
Net earnings per common share-diluted (in dollars per share)	$ 1.51	$ 1.33	$ 2.71	$ 2.45
Weighted average common shares outstanding-basic (in shares)	13,312	13,494	13,334	13,464
Weighted average common shares outstanding-diluted (in shares)	13,350	13,586	13,408	13,597
Product [Member]
Net sales
Total	$ 363,497	$ 309,475	$ 699,098	$ 632,292
Cost of sales
Total	278,863	238,134	538,926	493,946
Services [Member]
Net sales
Total	48,068	35,568	93,839	69,283
Cost of sales
Total	$ 29,671	$ 21,409	$ 58,341	$ 41,426