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Earnings Per Share EPS - Reconciliation of Income (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Jan. 30, 2016
Jan. 31, 2015
Jan. 30, 2016
Jan. 31, 2015
Net income        
Basic earnings per share $ (1,953) $ 561 $ 4,991 $ 17,043
Dilution associated with stock compensation plans 0 0 0 0
Diluted earnings per share $ (1,953) $ 561 $ 4,991 $ 17,043
Shares        
Basic earnings per share (in shares) 44,021 43,612 43,933 43,435
Dilution associated with stock compensation plans (in shares) 0 379 424 769
Diluted earnings per share (in shares) 44,021 43,991 44,357 44,204
Per share income        
Basic earnings per share (in dollars per share) $ (0.04) $ 0.01 $ 0.11 $ 0.39
Dilution associated with stock compensation plans (in dollars per share) 0.00 0.00 0.00 0.00
Diluted earnings per share (in dollars per share) $ (0.04) $ 0.01 $ 0.11 $ 0.39