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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Oct. 28, 2012
Oct. 23, 2011
Oct. 28, 2012
Oct. 23, 2011
Income Taxes        
Effective income tax provision (benefit) (as a percent) 21.40% 37.70% 25.10% 37.80%
Federal taxes $ (1,933) $ (578) $ 189 $ (2,020)
State taxes (218) (129) 29 (418)
Permanent differences 405 303 661 533
Tax credits (355) (370) (710) (596)
Other (94) 152 20 318
Valuation allowance 1,013   (53)  
Income tax (benefit) provision from continuing operations $ (1,182) $ (622) $ 136 $ (2,183)