Stock-Based Compensation (Performance-Contingent Restricted Stock) - Additional Information (Detail) - Performance Contingent Restricted Stock $ in Millions	3 Months Ended	6 Months Ended
Jul. 15, 2017 USD ($)	Jul. 15, 2017 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to nonvested restricted stock granted by the Omnibus Plan	$ 18.1	$ 18.1
Expected weighted-average period to recognize compensation cost (years)		1 year 4 months 17 days
Intrinsic value of shares vested	$ 6.3	$ 6.3

Unrecognized cost of unvested share-based compensation awards.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

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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- Definition

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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- Definition

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

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