Performance Contingent ROIC Shares (Detail) (Return On Invested Capital, USD $) In Thousands, except Per Share data, unless otherwise specified	4 Months Ended
Apr. 25, 2015
Grant Date Fourth January Twenty Fifteen
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	414
Vesting date	Mar. 01, 2017
Fair value per share	$ 19.14
Grant Date January First Twenty Fourteen
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	366
Vesting date	Mar. 01, 2016
Fair value per share	$ 21.47

Share Based Compensation Arrangement By Share Based Payment Award Vesting Date

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ 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 (c)(2)(iii)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

+ Details

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