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Stock-Based Awards (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Apr. 23, 2016 | Apr. 25, 2015 | Apr. 23, 2016 | Apr. 25, 2015 | Jul. 25, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation | $ 3,892 | $ 3,219 | $ 12,600 | $ 10,773 |
Unrecognized compensation expense related to stock options | 30,300 |  | 30,300 |  |
Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation expense related to stock options | $ 3,400 |  | 3,400 |  |
Total compensation cost not yet recognized, period for recognition | 2 years 9 months 18 days |  |  |  |
RSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation expense related to stock options | $ 9,000 |  | $ 9,000 |  |
Total compensation cost not yet recognized, period for recognition | 2 years 9 months 18 days |  |  |  |
Granted (in shares) |  |  | 89,977 |  |
Shares outstanding (in shares) | 266,147 |  | 266,147 |  | 322,008
Performance RSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award service period |  |  | 3 years |  |
Unrecognized compensation expense related to stock options | $ 17,900 |  | $ 17,900 |  |
Total compensation cost not yet recognized, period for recognition | 1 year 7 months 6 days |  |  |  |
Compensation expense | $ 6,600 |  | $ 6,600 |  |
RSUs outstanding (in shares) |  |  | 170,304 |  |
Granted (in shares) |  |  | 238,209 |  |
Forfeited or cancelled (in shares) |  |  | 169,790 |  |
Shares outstanding (in shares) | 629,138 |  | 629,138 |  | 945,540
Target Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation |  |  | $ 5,200 |  |
Shares outstanding (in shares) | 503,848 |  | 503,848 |  |
Supplemental Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation |  |  | $ 300 |  |
Granted (in shares) |  |  | 67,905 |  |
Shares outstanding (in shares) | 125,290 |  | 125,290 |  |

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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 aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + 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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