Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2017	Jul. 31, 2016
Income Statement [Abstract]
Net sales	$ 276,827	$ 258,150
Cost of sales and distribution	218,333	198,833
Gross Profit	58,494	59,317
Selling and marketing expenses	18,153	16,463
General and administrative expenses	9,507	10,932
Operating Income	30,834	31,922
Interest expense	81	159
Other income	(619)	(197)
Income Before Income Taxes	31,372	31,960
Income tax expense	9,091	10,299
Net Income	$ 22,281	$ 21,661
Weighted Average Shares Outstanding
Basic (in shares)	16,271,788	16,264,380
Diluted (in shares)	16,355,045	16,380,983
Net earnings per share
Basic (in usd per share)	$ 1.37	$ 1.33
Diluted (in usd per share)	$ 1.36	$ 1.32