Stock-Based Compensation (Details) $ in Millions	12 Months Ended
Jan. 27, 2017 USD ($)
Performance Awards
Share-based Compensation Arrangement by Share-based Payment Award
Compensation expense not yet recognized	$ 0.1
Compensation expense not yet recognized, recognition period	3 months 18 days
Deferred Awards
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period	3 years
Compensation expense not yet recognized	$ 4.1
Compensation expense not yet recognized, recognition period	1 year 8 months 18 days
Year 1 \| Performance Awards
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting rights, percentage	25.00%
Year 1 \| Deferred Awards
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting rights, percentage	25.00%
Year 2 \| Performance Awards
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting rights, percentage	25.00%
Year 2 \| Deferred Awards
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting rights, percentage	25.00%
Year 3 \| Performance Awards
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting rights, percentage	50.00%
Year 3 \| Deferred Awards
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting rights, percentage	50.00%

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.

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

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

+ References

No definition available.

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- Definition

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.

+ 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 (a)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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.

+ References

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- Definition

Percentage of vesting of 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 (a)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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