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Stock-Based Awards - Narratives (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 29, 2017 | Jul. 28, 2018 | Jul. 29, 2017 | Jul. 30, 2016 | Jul. 25, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Proceeds from stock options exercised |  |  | $ 1,449 | $ 2,745 | $ 8,922
Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation expense related to stock options | $ 2,800 |  | $ 2,800 |  |
Total compensation cost not yet recognized, period for recognition | 2 years 7 months 1 day |  |  |  |
Share price (usd per share) | $ 90.30 |  | $ 90.30 |  |
Intrinsic value of options exercised |  |  | $ 7,800 | 15,000 | 24,900
Proceeds from stock options exercised |  |  | 1,400 | $ 2,700 | 8,900
RSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation expense related to stock options | $ 8,500 |  | $ 8,500 |  |
Total compensation cost not yet recognized, period for recognition | 2 years 7 months 1 day |  |  |  |
Granted (in shares) |  |  | 66,382 |  |
Forfeited or canceled (in shares) |  |  | 3,995 |  |
Shares outstanding (in shares) | 187,465 |  | 187,465 | 251,264 |
Share units vested (in shares) |  |  | 126,186 |  |
Fair value of shares expected to vest |  |  | $ 33,200 | $ 39,100 | $ 15,200
Performance RSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation expense related to stock options | $ 18,500 |  | 18,500 |  |
Total compensation cost not yet recognized, period for recognition | 2 years 1 day |  |  |  |
Compensation expense | $ 6,700 |  | $ 6,700 |  |
RSUs outstanding (in shares) |  |  | 198,140 |  |
Granted (in shares) |  |  | 274,282 |  |
Forfeited or canceled (in shares) |  |  | 58,778 |  |
Shares outstanding (in shares) | 553,882 |  | 553,882 | 625,971 |
Share units vested (in shares) |  |  | 287,593 |  |
Target Share Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares outstanding (in shares) | 413,805 |  | 413,805 |  |
Supplemental Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Granted (in shares) |  |  | 76,142 |  |
Forfeited or canceled (in shares) |  |  | 49,797 |  |
Shares outstanding (in shares) | 140,077 |  | 140,077 |  |
Supplemental Shares | Forecasted |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Forfeited or canceled (in shares) |  | 21,136 |  |  |
Share units vested (in shares) |  | 46,211 |  |  |

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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 cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + 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 (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + 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 equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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