Earnings Per Share - Schedule of Computation of Basic and Diluted Earnings Per Share from Continuing Operations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	4 Months Ended
	Apr. 22, 2017	Apr. 23, 2016
Numerator:
Earnings from continuing operations	$ 15,065	$ 9,960
Adjustment for earnings attributable to participating securities	(276)	(178)
Earnings from continuing operations used in calculating earnings per share	$ 14,789	$ 9,782
Denominator:
Weighted average shares outstanding, including participating securities	37,692	37,488
Adjustment for participating securities	(690)	(669)
Shares used in calculating basic earnings per share	37,002	36,819
Effect of dilutive stock options	64	56
Shares used in calculating diluted earnings per share	37,066	36,875
Basic earnings per share from continuing operations	$ 0.40	$ 0.27
Diluted earnings per share from continuing operations	$ 0.40	$ 0.27