Share Based Compensation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	4 Months Ended
Apr. 25, 2015 OptionPlan	Apr. 19, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of approved stock incentive plans	2
Share based compensation expense, Net of Tax	$ 2.9	$ 2.4
Share based compensation expense Per diluted share, Net of Tax	$ 0.08	$ 0.06
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted	0	0
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 8.0
Unrecognized compensation cost, weighted average period of recognition	2 years 9 months 18 days

Allocated share based compensation expense net of tax per diluted share.

No definition available.

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- Definition

Number of approved stock incentive plans.

+ References

No definition available.

+ Details

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- Definition

The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

No definition available.

+ Details

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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=6415400&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.

+ References

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- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

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