Condensed Consolidated Statements Of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Condensed Consolidated Statements Of Operations [Abstract]
Net sales	$ 151,346	$ 119,976	$ 459,358	$ 379,593
Cost of sales and distribution	127,839	105,388	389,014	330,484
Gross Profit	23,507	14,588	70,344	49,109
Selling and marketing expenses	13,083	13,671	42,576	44,155
General and administrative expenses	6,714	6,273	18,977	18,780
Restructuring charges, net	118	10,347	979	10,362
Insurance recoveries	0	0	(399)	0
Operating Income (Loss)	3,592	(15,703)	8,211	(24,188)
Interest expense	157	132	474	406
Other income	(41)	(182)	(125)	(510)
Income (Loss) Before Income Taxes	3,476	(15,653)	7,862	(24,084)
Income tax expense (benefit)	1,419	(6,539)	3,294	(9,278)
Net Income (Loss)	$ 2,057	$ (9,114)	$ 4,568	$ (14,806)
Weighted Average Shares Outstanding
Basic	14,581,573	14,361,953	14,498,483	14,330,863
Diluted	14,904,524	14,361,953	14,719,441	14,330,863
Net earnings (loss) per share
Basic	$ 0.14	$ (0.63)	$ 0.32	$ (1.03)
Diluted	$ 0.14	$ (0.63)	$ 0.31	$ (1.03)
Cash dividends per share	$ 0.00	$ 0.00	$ 0.00	$ 0.09