Earnings Per Share - Schedule of Computation of Basic and Diluted Earnings Per Share for Continuing Operations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	4 Months Ended
Apr. 25, 2015	Apr. 19, 2014
Numerator:
Earnings from continuing operations	$ 10,447	$ 12,519
Adjustment for earnings attributable to participating securities	(189)	(232)
Earnings from continuing operations used in calculating earnings per share	$ 10,258	$ 12,287
Denominator:
Weighted average shares outstanding, including participating securities	37,689	37,600
Adjustment for participating securities	(682)	(697)
Shares used in calculating basic earnings per share	37,007	36,903
Effect of dilutive stock options	113	118
Shares used in calculating diluted earnings per share	37,120	37,021
Basic earnings per share from continuing operations	$ 0.28	$ 0.33
Diluted earnings per share from continuing operations	$ 0.28	$ 0.33

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

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Adjustment to net income loss for earnings per share calculation.

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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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- Definition

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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- Definition

This element represents the weighted average total number of shares issued throughout the period including the first (beginning balance outstanding) and last (ending balance outstanding) day of the period before considering any reductions (for instance, shares held in treasury) to arrive at the weighted average number of shares outstanding. Weighted average relates to the portion of time within a reporting period that common shares have been issued and outstanding to the total time in that period. Such concept is used in determining the weighted average number of shares outstanding for purposes of calculating earnings per share (basic).

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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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Number of shares of restricted stock determined by relating the portion of time within a reporting period that restricted shares have been outstanding to the total time in that period. Restricted shares are subject to sales, contractual, regulatory or other restrictions that prevent or inhibit the holder from freely disposing of them before the restriction ends.

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