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Earnings Per Share EPS - Reconciliation of Income (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Jan. 25, 2014
Jan. 26, 2013
Jan. 25, 2014
Jan. 26, 2013
Net income        
Basic earnings per share $ 2,871 $ 2,710 $ 20,380 $ 20,935
Dilution associated with stock compensation plans 0 0 0 0
Diluted earnings per share $ 2,871 $ 2,710 $ 20,380 $ 20,935
Shares        
Basic earnings per share (in shares) 43,039 42,343 42,772 42,206
Dilution associated with stock compensation plans (in shares) 574 196 625 241
Diluted earnings per share (in shares) 43,613 42,539 43,397 42,447
Per share income        
Basic earnings per share (in dollars per share) $ 0.07 $ 0.06 $ 0.48 $ 0.50
Dilution associated with stock compensation plans (in dollars per share) $ 0.00 $ 0.00 $ (0.01) $ (0.01)
Diluted earnings per share (in dollars per share) $ 0.07 $ 0.06 $ 0.47 $ 0.49