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Stock-Based Awards (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jan. 23, 2016 | Jan. 23, 2016 | Jul. 25, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation expense related to stock options | $ 34.2 | $ 34.2 |
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation expense related to stock options | $ 3.8 | 3.8 |
Total compensation cost not yet recognized, period for recognition | 2 years 11 months 5 days |  |
RSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation expense related to stock options | $ 9.9 | $ 9.9 |
Total compensation cost not yet recognized, period for recognition | 2 years 11 months 5 days |  |
Granted (in shares) |  | 82,043 |
Shares outstanding (in shares) | 271,937 | 271,937 | 322,008
Performance RSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation expense related to stock options | $ 20.5 | $ 20.5 |
Total compensation cost not yet recognized, period for recognition | 1 year 8 months 13 days |  |
Compensation expense | $ 6.9 | $ 6.9 |
RSUs outstanding (in shares) |  | 170,304 |
Granted (in shares) |  | 238,209 |
Forfeited or cancelled (in shares) |  | 169,790 |
Shares outstanding (in shares) | 640,325 | 640,325 | 945,540
Target Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares outstanding (in shares) | 513,973 | 513,973 |
Supplemental Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted (in shares) |  | 67,905 |
Shares outstanding (in shares) | 126,352 | 126,352 |

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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 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 + Details
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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 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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