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Earnings Per Share EPS - Reconciliation of Income (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Oct. 31, 2015
Nov. 01, 2014
Oct. 31, 2015
Nov. 01, 2014
Net income        
Basic earnings per share $ 3,168 $ 7,737 $ 6,944 $ 16,482
Dilution associated with stock compensation plans 0 0 0 0
Diluted earnings per share $ 3,168 $ 7,737 $ 6,944 $ 16,482
Shares        
Basic earnings per share (in shares) 43,934 43,405 43,890 43,350
Dilution associated with stock compensation plans (in shares) 179 393 365 576
Diluted earnings per share (in shares) 44,113 43,798 44,255 43,926
Per share income        
Basic earnings per share (in dollars per share) $ 0.07 $ 0.18 $ 0.16 $ 0.38
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) $ 0.07 $ 0.18 $ 0.16 $ 0.38