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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. 21, 2018	Apr. 22, 2017
Numerator:
Earnings from continuing operations	$ 12,435	$ 15,065
Adjustment for earnings attributable to participating securities	(246)	(276)
Earnings from continuing operations used in calculating earnings per share	$ 12,189	$ 14,789
Denominator:
Weighted average shares outstanding, including participating securities	36,186	37,692
Adjustment for participating securities	(717)	(690)
Shares used in calculating basic earnings per share	35,469	37,002
Effect of dilutive stock options	11	64
Shares used in calculating diluted earnings per share	35,480	37,066
Basic earnings per share from continuing operations	$ 0.34	$ 0.40
Diluted earnings per share from continuing operations	$ 0.34	$ 0.40

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Amount after tax of income (loss) from continuing operations attributable to the parent.

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The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period.

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