Condensed Consolidated Statements Of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012	Oct. 31, 2011
Condensed Consolidated Statements Of Operations [Abstract]
Net sales	$ 159,760	$ 128,418	$ 308,012	$ 259,617
Cost of sales and distribution	134,966	112,304	261,175	225,096
Gross Profit	24,794	16,114	46,837	34,521
Selling and marketing expenses	14,973	14,508	29,493	30,484
General and administrative expenses	6,624	6,166	12,263	12,507
Restructuring charges, net	84	0	861	15
Insurance recoveries	(399)	0	(399)	0
Operating Income (Loss)	3,512	(4,560)	4,619	(8,485)
Interest expense	166	137	317	274
Other income	(25)	(174)	(84)	(328)
Income (Loss) Before Income Taxes	3,371	(4,523)	4,386	(8,431)
Income tax expense (benefit)	1,421	(1,547)	1,875	(2,739)
Net Income (Loss)	$ 1,950	$ (2,976)	$ 2,511	$ (5,692)
Weighted Average Shares Outstanding
Basic	14,498,269	14,330,954	14,456,938	14,315,318
Diluted	14,677,640	14,330,954	14,626,899	14,315,318
Net earnings (loss) per share
Basic	$ 0.13	$ (0.21)	$ 0.17	$ (0.40)
Diluted	$ 0.13	$ (0.21)	$ 0.17	$ (0.40)
Cash dividends per share	$ 0.00	$ 0.00	$ 0.00	$ 0.09