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Share-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 05, 2019 $ / shares shares | Apr. 27, 2018 shares | Oct. 05, 2016 shares | Apr. 28, 2019 $ / shares shares | Apr. 29, 2018 USD ($) employee shares | Oct. 28, 2018 USD ($) | Jan. 27, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Maximum number of shares subject to purchase under warrants | shares |  |  | 1,086,957 |  |  |  |
Warrants vested (in shares) | shares |  | 586,956 |  |  |  |  |
Warrant vesting costs | $ |  |  |  |  |  | $ 21.5 |
Warrant vesting costs due to acceleration | $ |  |  |  |  |  | $ 15.9 |
Number of securities called by warrants (in shares) | shares |  |  |  |  |  |  | 869,565
Number of shares affected (in shares) | shares |  |  |  |  | 159,000 |  |
Number of employees affected | employee |  |  |  |  | 8 |  |
Additional compensation cost | $ |  |  |  |  | $ 2.8 |  |
Market Performance-based RSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Equity awards granted | shares |  |  |  | 106,000 |  |  |
Description of award vesting rights |  |  |  | one-third of the awards vesting each performance period |  |  |
Performance Period One | Market Performance-based RSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Performance period |  |  |  | 1 year |  |  |
Grant date fair value per unit |  |  |  | $ 55.82 |  |  |
Performance Period Two | Market Performance-based RSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Performance period |  |  |  | 2 years |  |  |
Grant date fair value per unit |  |  |  | $ 59.36 |  |  |
Performance Period Three | Market Performance-based RSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Performance period |  |  |  | 3 years |  |  |
Grant date fair value per unit |  |  |  | $ 61.45 |  |  |
CEO | Market Performance-based RSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Equity awards granted | shares |  |  |  | 160,000 |  |  |
CEO | Market Performance Restricted Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Equity awards granted | shares | 320,000 |  |  |  |  |  |
Vesting percentage, prorated | 70.00% |  |  |  |  |  |
CEO | Performance Period One | Market Performance-based RSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Performance period |  |  |  | 1 year |  |  |
Grant date fair value per unit |  |  |  | $ 55.82 |  |  |
CEO | Performance Period One | Market Performance Restricted Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting percent |  |  |  | 25.00% |  |  |
Grant date fair value per unit | $ 44.32 |  |  |  |  |  |
CEO | Performance Period Two | Market Performance-based RSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Performance period |  |  |  | 2 years |  |  |
Grant date fair value per unit |  |  |  | $ 59.36 |  |  |
CEO | Performance Period Two | Market Performance Restricted Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting percent |  |  |  | 25.00% |  |  |
Grant date fair value per unit | $ 33.19 |  |  |  |  |  |
CEO | Performance Period Three | Market Performance-based RSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Performance period |  |  |  | 3 years |  |  |
Grant date fair value per unit |  |  |  | $ 61.45 |  |  |
CEO | Performance Period Three | Market Performance Restricted Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting percent |  |  |  | 25.00% |  |  |
CEO | Performance Period Four | Market Performance-based RSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Performance period |  |  |  | 4 years |  |  |
Grant date fair value per unit |  |  |  | $ 62.98 |  |  |
CEO | Performance Period Four | Market Performance Restricted Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting percent |  |  |  | 25.00% |  |  |
CEO | Average Share Price Equals To Or Exceeds $71.00 | Market Performance Restricted Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting percent | 30.00% |  |  |  |  |  |
CEO | Average Share Price Equals Or Exceeds $95.00 | Market Performance Restricted Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting percent | 70.00% |  |  |  |  |  |
CEO | Average Share Price Between $71.00 and $95.00 | Market Performance Restricted Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting percent | 30.00% |  |  |  |  |  |

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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Description of service or performance condition required to be met for earning right to award under share-based payment arrangement. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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