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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 24, 2016
Jan. 25, 2015
Jan. 24, 2016
Jan. 25, 2015
Income Taxes        
Federal taxes at the statutory rate $ 2,772 $ 2,349 $ 9,079 $ 2,423
State taxes (9) (66) (297) (566)
Permanent differences 335 196 914 2,196
Tax credits (357) (111) (1,070) (777)
Other   1 93 41
Valuation allowance (1,837) (1,583) (6,072) (524)
Income tax provision from continuing operations $ 904 $ 786 $ 2,647 $ 2,793