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Discontinued Operations (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2012
Oct. 31, 2011
Summary of the operating results of the discontinued operations        
Net sales from discontinued operations   $ 5,987 $ 6,732 $ 13,448
Loss before income taxes (867) (4,004) (2,550) (6,706)
Income tax expense 9,253 428 20,061 2,182
Net loss from discontinued operations $ 4,784 $ (2,539) $ 3,699 $ (4,025)