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Shareholders' Equity - Preferred and Common Stock and Dividends (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
May 03, 2014
Apr. 27, 2013
Apr. 28, 2012
Class of Stock [Line Items]      
Common stock - par value per share (in dollars per share) $ 0.50 $ 0.50  
Authorized (in shares) 100,000,000 100,000,000  
Issued and outstanding (in shares) 39,262,168 38,455,853  
In treasury (in shares) 1,342,188 1,342,188  
Dividends paid $ 11.3 $ 10.3 $ 10.4