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Subsequent Events - (Details) (USD $)
12 Months Ended 0 Months Ended
Apr. 27, 2013
Apr. 28, 2012
Apr. 30, 2011
May 23, 2013
Subsequent Event
Subsequent Event [Line Items]        
Cash dividend declared (usd per share) $ 0.73 $ 0.62 $ 0.60 $ 0.12