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Income Taxes - Allocation of Income Tax Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
May. 03, 2015
Feb. 01, 2015
Nov. 02, 2014
Aug. 03, 2014
Apr. 27, 2014
Jan. 26, 2014
Oct. 27, 2013
Jul. 28, 2013
May. 03, 2015
Apr. 27, 2014
Apr. 28, 2013
Income Tax Disclosure [Abstract]                      
income from operations $ 1,772 $ 2,110 $ 1,889 $ 2,115 $ 1,380 $ (3,807) $ 1,718 $ 2,305 $ 7,885 $ 1,596 $ 1,972
shareholders' equity, related to the tax benefit arising from stock based compensation                 (109) (143) (76)
income tax expense (benefit), excluding tax benefit from exercise of stock options                 $ 7,776 $ 1,453 $ 1,896