Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2016	Jul. 31, 2015
Income Statement [Abstract]
Net sales	$ 258,150	$ 231,198
Cost of sales and distribution	198,833	181,025
Gross Profit	59,317	50,173
Selling and marketing expenses	16,463	15,719
General and administrative expenses	10,932	10,731
Operating Income	31,922	23,723
Interest expense	159	54
Other income	(197)	(52)
Income Before Income Taxes	31,960	23,721
Income tax expense	10,299	8,563
Net Income	$ 21,661	$ 15,158
Weighted Average Shares Outstanding
Basic (in shares)	16,264,380	16,180,860
Diluted (in shares)	16,380,983	16,421,230
Net earnings per share
Basic (in usd per share)	$ 1.33	$ 0.94
Diluted (in usd per share)	$ 1.32	$ 0.92