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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. 20, 2019	Apr. 21, 2018
Numerator:
Earnings from continuing operations	$ 7,521	$ 12,435
Adjustment for earnings attributable to participating securities	(183)	(246)
Earnings from continuing operations used in calculating earnings per share	$ 7,338	$ 12,189
Denominator:
Weighted average shares outstanding, including participating securities	36,121	36,186
Adjustment for participating securities	(878)	(717)
Shares used in calculating basic earnings per share	35,243	35,469
Effect of dilutive stock options		11
Shares used in calculating diluted earnings per share	35,243	35,480
Basic earnings per share from continuing operations	$ 0.21	$ 0.34
Diluted earnings per share from continuing operations	$ 0.21	$ 0.34

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

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