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Income Taxes - Allocation of Income Tax Expense (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Apr. 27, 2014
Jan. 26, 2014
Oct. 27, 2013
Jul. 28, 2013
Apr. 28, 2013
Jan. 27, 2013
Oct. 28, 2012
Jul. 29, 2012
Apr. 27, 2014
Apr. 28, 2013
Apr. 29, 2012
Income Tax Disclosure [Abstract]                      
income from operations $ 1,380 $ (3,807) $ 1,718 $ 2,305 $ 2,161 $ 1,700 $ (3,736) $ 1,848 $ 1,596 $ 1,972 $ 902
shareholders' equity, related to the tax benefit arising from stock based compensation                 (143) (76) (64)
income tax expense (benefit), excluding tax benefit from exercise of stock options                 $ 1,453 $ 1,896 $ 838