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. 16, 2016	Jul. 18, 2015	Jul. 16, 2016	Jul. 18, 2015
Numerator:
Earnings from continuing operations	$ 17,560	$ 20,307	$ 27,520	$ 30,754
Adjustment for earnings attributable to participating securities	(314)	(350)	(492)	(546)
Earnings from continuing operations used in calculating earnings per share	$ 17,246	$ 19,957	$ 27,028	$ 30,208
Denominator:
Weighted average shares outstanding, including participating securities	37,475	37,584	37,483	37,644
Adjustment for participating securities	(670)	(648)	(670)	(668)
Shares used in calculating basic earnings per share	36,805	36,936	36,813	36,976
Effect of dilutive stock options	71	126	59	126
Shares used in calculating diluted earnings per share	36,876	37,062	36,872	37,102
Basic earnings per share from continuing operations	$ 0.47	$ 0.54	$ 0.73	$ 0.82
Diluted earnings per share from continuing operations	$ 0.47	$ 0.54	$ 0.73	$ 0.81

Adjusted net income loss from continuing operations for earnings per share calculation.

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- Definition

Adjustment to net income loss attributable to participating securities.

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Weighted average number of shares adjustment basic.

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Weighted average number of shares outstanding basic including participating securities.

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- Definition

Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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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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The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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