Acquisition (Details 3) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Apr. 26, 2013
Apr. 27, 2012
Business Combination Pro Forma [Line Items]    
Pro Forma Revenue $ 1,616,832 $ 1,687,082
Pro Forma Net Income $ (2,895) $ 73,869
Pro Forma Basic Earnings Per Share $ (0.10) $ 2.49
Pro Form Diluted Earnings (Loss) Per Share $ (0.10) $ 2.48