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Shareholders' Equity and Share-Based Compensation - Nonvested Restricted Stock and RSU Activity (Details) (Restricted Stock and Restricted Stock Units, USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Apr. 27, 2013
Apr. 28, 2012
Apr. 30, 2011
Restricted Stock and Restricted Stock Units
     
Number of Nonvested Shares      
Outstanding at beginning of year, Nonvested Shares 242 181 121
Granted, Nonvested Shares 119 118 103
Vested, Nonvested Shares (69) (49) (35)
Forfeited, Nonvested Shares (13) (8) (8)
Outstanding at end of year, Nonvested Shares 279 242 181
Weighted Average Grant Date Fair Value Per Share      
Outstanding at beginning of year, Weighted Average Grant Date Fair Value (usd per share) $ 9.81 $ 11.07 $ 8.21
Granted, Weighted Average Grant Date Fair Value (usd per share) $ 8.50 $ 8.24 $ 13.29
Vested, Weighted Average Grant Date Fair Value (usd per share) $ 12.05 $ 10.51 $ 8.24
Forfeited, Weighted Average Grant Date Fair Value (usd per share) $ 9.63 $ 10.85 $ 9.17
Outstanding at end of year, Weighted Average Grant Date Fair Value (usd per share) $ 9.74 $ 9.81 $ 11.07