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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Jan. 27, 2013
Jan. 22, 2012
Jan. 27, 2013
Jan. 22, 2012
Income Taxes        
Effective income tax provision (benefit) (as a percent) 23.20% 38.80% 21.70% 37.90%
Federal taxes $ (457) $ (180) $ (268) $ (2,201)
State taxes (67) (55) (38) (473)
Permanent differences 337 347 998 880
Tax credits (355) (436) (1,066) (1,032)
Other 76 124 96 443
Valuation allowance 164   112  
Income tax benefit from continuing operations $ (302) $ (200) $ (166) $ (2,383)