Condensed Consolidated Statements Of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014
Income Statement [Abstract]
Net sales	$ 188,963	$ 169,033	$ 618,573	$ 537,660
Cost of sales and distribution	153,846	143,032	509,361	445,670
Gross Profit	35,117	26,001	109,212	91,990
Selling and marketing expenses	16,010	14,287	47,821	44,638
General and administrative expenses	8,054	6,564	24,710	22,555
Restructuring charges, net	3	48	6	161
Insurance proceeds	0	0	0	(94)
Operating Income	11,050	5,102	36,675	24,730
Interest expense	131	182	445	554
Other income	(57)	(33)	(122)	(90)
Income Before Income Taxes	10,976	4,953	36,352	24,266
Income tax expense	3,694	2,052	12,161	9,439
Net Income	$ 7,282	$ 2,901	$ 24,191	$ 14,827
Weighted Average Shares Outstanding
Basic (shares)	15,859,533	15,475,683	15,687,944	15,218,558
Diluted (shares)	16,131,140	15,827,666	15,953,420	15,595,342
Net earnings per share
Basic (usd per share)	$ 0.46	$ 0.19	$ 1.54	$ 0.97
Diluted (usd per share)	$ 0.45	$ 0.18	$ 1.52	$ 0.95