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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	3 Months Ended		6 Months Ended
	Jul. 14, 2018	Jul. 15, 2017	Jul. 14, 2018	Jul. 15, 2017
Numerator:
Earnings from continuing operations	$ 17,838	$ 21,060	$ 30,273	$ 36,125
Adjustment for earnings attributable to participating securities	(414)	(357)	(644)	(640)
Earnings from continuing operations used in calculating earnings per share	$ 17,424	$ 20,703	$ 29,629	$ 35,485
Denominator:
Weighted average shares outstanding, including participating securities	35,928	37,809	36,075	37,742
Adjustment for participating securities	(833)	(641)	(767)	(669)
Shares used in calculating basic earnings per share	35,095	37,168	35,308	37,073
Effect of dilutive stock options	13	22	12	45
Shares used in calculating diluted earnings per share	35,108	37,190	35,320	37,118
Basic earnings per share from continuing operations	$ 0.50	$ 0.56	$ 0.84	$ 0.96
Diluted earnings per share from continuing operations	$ 0.50	$ 0.56	$ 0.84	$ 0.96

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