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Share-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions |  |  |  | 3 Months Ended
--- | --- | --- | --- | ---
Mar. 05, 2019 $ / shares shares | Apr. 27, 2018 shares | Oct. 05, 2016 shares | Apr. 28, 2019 USD ($) $ / shares shares | Apr. 29, 2018 USD ($) employee 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 | 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 | Share Price Over $95.00 | Market Performance Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percent | 70.00% |  |  |  |
CEO | 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://www.xbrl.org/2003/role/presentationRef -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 award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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=96867065&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://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=96867065&loc=d3e5070-113901 + Details
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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 No definition available. + Details
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- Definition An excess of the fair value of the modified award over the fair value of the award immediately before the modification. + 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 (h)(2)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) that have been approved for issuance in the equity-based payment transaction. + 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)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666 + Details
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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=96867065&loc=d3e5070-113901 + Details
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