Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2013
Income Statement [Abstract]
Net sales	$ 825,465	$ 726,515	$ 630,437
Cost of sales and distribution	672,933	602,338	527,781
Gross Profit	152,532	124,177	102,656
Selling and marketing expenses	64,304	59,536	57,402
General and administrative expenses	33,773	30,881	27,575
Restructuring charges, net	(240)	(234)	1,433
Insurance proceeds	0	(94)	(975)
Operating Income	54,695	34,088	17,221
Interest expense	515	728	643
Other income	(207)	(310)	(162)
Income Before Income Taxes	54,387	33,670	16,740
Income tax expense	18,888	13,209	6,982
Net Income	$ 35,499	$ 20,461	$ 9,758
Earnings per share
Basic (usd per share)	$ 2.25	$ 1.34	$ 0.67
Diluted (usd per share)	$ 2.21	$ 1.31	$ 0.66