Percentage of conversion price equaling stock price.

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Share based compensation arrangement by share based payment award shares deferred at vesting.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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- Definition

Number of share instruments newly issued under a share-based compensation plan.

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Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options.

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Per share or per unit amount of equity securities issued.

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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Aggregate value of stock related to Restricted Stock Awards issued during the period.

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Stock-Based Compensation (Deferred and Restricted Stock) - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended	6 Months Ended
	May 31, 2013	Jul. 14, 2018	Jul. 14, 2018	Jul. 15, 2017
Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock award	$ 1.3
Restricted shares issued	58,500
Restricted Stock Award \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares per share	$ 22.25
Restricted stock award vested price				$ 18.48
Deferred Stock Activity
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to nonvested restricted stock granted by the Omnibus Plan		$ 1.3	$ 1.3
Expected weighted-average period to recognize compensation cost (years)			10 months 2 days
Intrinsic value of shares vested		$ 1.7	$ 1.7
Annual Grants \| Deferred and restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate shares elected to receive		63,180
Number of shares deferred at vesting		14,040
Annual Grants \| Deferred and restricted stock \| Non Employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate shares elected to receive			65,000
Annual Grants \| Deferred and restricted stock \| Non Employee Directors \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			1 year
Retainer Conversion
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Retainers conversion into deferred shares			100.00%
Vesting period			1 year
Previous Director Retainer Deferrals \| Deferred and restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares vested			10,020
Common shares issued			10,020
Director Retainer Deferrals \| Omnibus Plan \| Deferred and restricted stock \| Non Employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate shares elected to receive			12,950