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Shareholders' Equity - Schedule of Restricted Stock Awards and Restricted Stock Units by Grant Year and Vesting Period (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Apr. 28, 2018 | Apr. 29, 2017 | Apr. 30, 2016 | Apr. 28, 2012 | May 01, 2011 | May 02, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Document Fiscal Year Focus | 2018 |  |  |  |  |
Document Period End Date | Apr. 28, 2018 |  |  |  |  |
Current Fiscal Year End Date | --04-28 |  |  |  |  |
2010 Stock Plan | RSAs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Awarded (in shares) | 0 | 0 | 0 | 100,000 | 320,000 |
Number of Shares Unvested (in shares) | 0 | 0 | 33,334 |  |  | 66,667
Annual vesting percentage | 33.30% |  |  |  | 20.00% |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested Shares Yet to be Awarded | 210,000 |  |  |  |  |
2014 Incentive Plan | RSAs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Awarded (in shares) | 152,738 | 99,000 | 1,185,000 |  |  |
Number of Shares Unvested (in shares) | 1,171,238 | 1,168,500 | 1,161,000 |  |  | 0
2014 Incentive Plan | RSUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Awarded (in shares) | 30,925 | 32,000 | 576,000 |  |  |
Number of Shares Unvested (in shares) | 382,372 | 568,000 | 576,000 |  |  | 0
Weighted Average Value (in dollars per share) | $ 35.85 |  |  |  |  |
Unearned compensation expense | $ 5.1 |  |  |  |  |
2014 Incentive Plan | RSUs | Target |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unearned compensation expense | $ 5.1 |  |  |  |  |
Threshold Performance | 2014 Incentive Plan | RSAs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of Shares Unvested (in shares) | 363,413 |  |  |  |  |
Weighted Average Value (in dollars per share) | $ 34.11 |  |  |  |  |
Unearned compensation expense | $ 5.5 |  |  |  |  |
Threshold Performance | 2014 Incentive Plan | RSAs | Target |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unearned compensation expense | $ 11.0 |  |  |  |  |

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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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