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Advertising Costs (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2012
Oct. 31, 2011
Advertising Costs (Textual) [Abstract]        
Advertising expense for continuing operations $ 4.0 $ 3.8 $ 7.1 $ 6.8