CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) [Abstract]
Net sales	$ 356,532	$ 373,356
Cost of sales	275,829	295,763
Gross profit	80,703	77,593
Selling, general, and administrative expenses	56,966	54,664
Depreciation and amortization	2,790	2,063
Interest and financing costs	476	359
Operating expenses	60,232	57,086
Operating income	20,471	20,507
Other income	97	271
Earnings before tax	20,568	20,778
Provision for income taxes	5,295	7,355
Net earnings	$ 15,273	$ 13,423
Net earnings per common share-basic (in dollars per share)	$ 1.14	$ 0.97
Net earnings per common share-diluted (in dollars per share)	$ 1.12	$ 0.96
Weighted average common shares outstanding-basic (in shares)	13,434	13,806
Weighted average common shares outstanding-diluted (in shares)	13,597	14,019