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Shareholders' Equity - Schedule of Restricted Stock Awards and Restricted Stock Units by Grant Year and Vesting Period (Details) - 2014 Incentive Plan - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Apr. 30, 2016 | May 02, 2015 | Jul. 15, 2014
RSAs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Awarded (in shares) | 1,185,000 | 13,500 |
RSAs | Five-year RSA cliff, performance-based |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Awarded (in shares) | 774,000 |  |
Weighted average value (in dollars per share) | $ 31.98 |  |
Unearned compensation expense | $ 21.9 |  |
RSAs | Five-year RSA cliff, performance-based | Target |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unearned compensation expense | $ 21.9 |  |
RSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Awarded (in shares) | 576,000 | 0 |
Unearned compensation expense |  |  | $ 18.4
RSUs | Five-year RSU, 30% in fiscal 2018, 30% in fiscal 2019 and 40% in fiscal 2020 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Awarded (in shares) | 576,000 |  |
Weighted average value (in dollars per share) | $ 32.02 |  |
Unearned compensation expense | $ 15.6 |  |
RSUs | Five-year RSU, 30% in fiscal 2018, 30% in fiscal 2019 and 40% in fiscal 2020 | Target |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unearned compensation expense | $ 15.6 |  |

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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 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=6415400&loc=d3e5070-113901 + Details
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