Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011
Consolidated Statements Of Operations [Abstract]
Net sales	$ 630,437	$ 515,814	$ 452,589
Cost of sales and distribution	527,781	449,339	399,838
Gross Profit	102,656	66,475	52,751
Selling and marketing expenses	57,402	58,271	61,034
General and administrative expenses	27,575	25,329	22,709
Restructuring charges	1,433	16,321	62
Insurance proceeds	(975)	0	0
Operating Income (Loss)	17,221	(33,446)	(31,054)
Interest expense	643	527	572
Other income	(162)	(685)	(1,666)
Income (Loss) Before Income Taxes	16,740	(33,288)	(29,960)
Income tax expense (benefit)	6,982	(12,502)	(9,942)
Net Income (Loss)	$ 9,758	$ (20,786)	$ (20,018)
Earnings (loss) per share
Basic	$ 0.67	$ (1.45)	$ (1.40)
Diluted	$ 0.66	$ (1.45)	$ (1.40)
Cash dividends per share	$ 0.00	$ 0.09	$ 0.36