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Shareholders' Equity - Narrative (Details) | 3 Months Ended | 12 Months Ended |  |
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Apr. 28, 2018 USD ($) shares $ / shares | Jan. 27, 2018 USD ($) | Oct. 28, 2017 USD ($) | Jul. 29, 2017 USD ($) | Apr. 28, 2018 USD ($) shares $ / shares | Apr. 29, 2017 USD ($) $ / shares shares | Apr. 30, 2016 USD ($) shares | Apr. 28, 2012 shares | May 01, 2011 shares | May 02, 2015 shares | Apr. 30, 2007 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount | $ | $ 100,000,000 |  |  |  | $ 100,000,000 |  |  |  |  |  |
Purchase of common stock (in shares) |  |  |  |  | 0 | 280,168 | 1,997,298 |  |  |  |
Purchase of common stock | $ |  |  |  |  |  | $ 9,800,000 | $ 62,300,000 |  |  |  |
Dividends paid | $ |  |  |  |  | $ 14,700,000 | 13,700,000 | 13,500,000 |  |  |  |
Compensation expense | $ |  |  |  |  | $ 4,000,000 | $ 12,400,000 | 7,400,000 |  |  |  |
Common stock - par value per share (in dollars per share) | $ / shares | $ 0.50 |  |  |  | $ 0.50 | $ 0.50 |  |  |  |  |
Unrecognized equity-based compensation cost | $ | $ 10,600,000 |  |  |  | $ 10,600,000 |  |  |  |  |  |
Weighted average period for recognition of unrecognized equity-based compensation cost |  |  |  |  | 2 years 4 days |  |  |  |  |  |
2014 Incentive Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized for grant (in shares) | 3,000,000 |  |  |  | 3,000,000 |  |  |  |  |  |
Number of shares available for award (in shares) | 1,186,034 |  |  |  | 1,186,034 |  |  |  |  |  |
Compensation expense | $ |  |  |  |  | $ 4,000,000 | $ 12,100,000 | $ 6,400,000 |  |  |  |
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 |  |  |  |
Multiplier, threshold performance |  |  |  |  | 50.00% |  |  |  |  |  |
Multiplier, target performance |  |  |  |  | 100.00% |  |  |  |  |  |
Multiplier, maximum performance |  |  |  |  | 150.00% |  |  |  |  |  |
EBITDA goal, percentage of likelihood |  |  |  |  | 70.00% |  |  |  |  |  |
Compensation expense | $ |  |  |  |  | $ (1,000,000) | $ 6,600,000 | $ 3,600,000 |  |  |  |
Number of RSUs outstanding (in shares) | 1,171,238 |  |  |  | 1,171,238 | 1,168,500 | 1,161,000 |  |  | 0 |
Vested (in shares) |  |  |  |  | 24,000 | 27,000 | 24,000 |  |  |  |
2014 Incentive Plan | RSAs | Executives and non-executive members of management |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allocated share-based compensation expense, amount recorded to true-up prior periods | $ | $ 0 | $ (6,000,000) | $ 0 | $ 0 |  |  |  |  |  |  |
Allocated share-based compensation expense, amount recorded to true-up prior periods (in dollars per share) | $ / shares |  |  |  |  | $ 0.12 |  |  |  |  |  |
Compensation expense | $ |  |  |  |  | $ (2,000,000) | $ 5,700,000 | $ 2,800,000 |  |  |  |
2014 Incentive Plan | RSAs | Independent directors |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Compensation expense | $ |  |  |  |  | $ 1,000,000 |  |  |  |  |  |
Number of shares issued (in shares) |  |  |  |  | 24,000 |  |  |  |  |  |
2014 Incentive Plan | RSUs |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Awarded (in shares) |  |  |  |  | 30,925 | 32,000 | 576,000 |  |  |  |
Expected compensation expense | $ |  |  |  |  | $ 18,400,000 |  |  |  |  |  |
Compensation expense | $ |  |  |  |  | $ 5,000,000 | $ 5,500,000 | $ 2,800,000 |  |  |  |
Number of RSUs outstanding (in shares) | 382,372 |  |  |  | 382,372 | 568,000 | 576,000 |  |  | 0 |
Vested (in shares) |  |  |  |  | 160,553 | 11,333 | 0 |  |  |  |
Unearned compensation expense | $ | $ 5,100,000 |  |  |  | $ 5,100,000 |  |  |  |  |  |
2014 Incentive Plan | RSUs | Vesting 2018 |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Award vesting percentage |  |  |  |  | 30.00% |  |  |  |  |  |
2014 Incentive Plan | RSUs | Vesting 2019 |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Award vesting percentage |  |  |  |  | 30.00% |  |  |  |  |  |
2014 Incentive Plan | RSUs | Vesting 2020 |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Award vesting percentage |  |  |  |  | 40.00% |  |  |  |  |  |
2014 Incentive Plan | RSUs | Executives and non-executive members of management |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Awarded (in shares) |  |  |  |  | 30,925 |  |  |  |  |  |
RSUs granted (in shares) | 638,925 |  |  |  | 638,925 |  |  |  |  |  |
Number of RSUs outstanding (in shares) | 382,372 |  |  |  | 382,372 |  |  |  |  |  |
2010 Stock Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized for grant (in shares) | 2,000,000 |  |  |  | 2,000,000 |  |  |  |  |  |
Compensation expense | $ |  |  |  |  | $ 0 | $ 200,000 | $ 400,000 |  |  |  |
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 RSUs outstanding (in shares) | 0 |  |  |  | 0 | 0 | 33,334 |  |  | 66,667 |
Annual vesting percentage |  |  |  |  | 33.30% |  |  |  | 20.00% |  |
Vested (in shares) |  |  |  |  | 0 | 33,334 | 33,333 |  |  |  |
Historic multiple of EBITDA, used to calculate internal enterprise value for determining size of awards |  |  |  |  |  |  |  | 7.5 |  |  |
2010 Stock Plan | Stock Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Compensation expense | $ |  |  |  |  | $ 0 | $ 100,000 | $ 300,000 |  |  |  |
Award vesting period |  |  |  |  | 3 years |  |  |  |  |  |
Awarded options to purchase number of shares (in shares) |  |  |  |  | 0 | 0 | 0 |  |  |  |
Award term |  |  |  |  | 10 years |  |  |  |  |  |
Annual vesting percentage |  |  |  |  | 33.30% |  |  |  |  |  |
Intrinsic value of outstanding options | $ | $ 300,000 |  |  |  | $ 300,000 |  |  |  |  |  |
2010 Stock Plan | RSUs |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Compensation expense | $ |  |  |  |  | $ 0 | $ 100,000 | $ 100,000 |  |  |  |
2007 Stock Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized for grant (in shares) | 1,250,000 |  |  |  | 1,250,000 |  |  |  |  |  |
Compensation expense | $ |  |  |  |  | $ 0 | 100,000 | 600,000 |  |  |  |
2007 Stock Plan | Stock Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Compensation expense | $ |  |  |  |  | $ 0 | $ 100,000 | $ 600,000 |  |  |  |
Awarded options to purchase number of shares (in shares) |  |  |  |  | 0 | 0 | 0 |  |  |  |
Award term |  |  |  |  | 10 years |  |  |  |  |  |
Annual vesting percentage |  |  |  |  | 33.30% |  |  |  |  |  |
Intrinsic value of outstanding options | $ | $ 300,000 |  |  |  | $ 300,000 |  |  |  |  |  |
2007 Stock Plan | RSUs |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares converted from RSAs to RSUs outstanding (in shares) | 195,055 |  |  |  | 195,055 |  |  |  |  |  |
Converted RSUs delivered (in shares) |  |  |  |  | 29,945 |  |  |  |  |  |
2007 Stock Plan | Converted from RSAs to RSUs |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares converted from RSAs to RSUs outstanding (in shares) |  |  |  |  |  |  |  |  |  |  | 225,000
Threshold Performance | 2014 Incentive Plan | RSAs |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of RSAs that may be earned (in shares) |  |  |  |  | 390,413 |  |  |  |  |  |
2020 EBITDA goal | $ |  |  |  |  | $ 198,900,000 |  |  |  |  |  |
Expected compensation expense | $ |  |  |  |  | $ 12,200,000 |  |  |  |  |  |
Number of RSUs outstanding (in shares) | 363,413 |  |  |  | 363,413 |  |  |  |  |  |
Unearned compensation expense | $ | $ 5,500,000 |  |  |  | $ 5,500,000 |  |  |  |  |  |
2020 EBITDA Target Performance | 2014 Incentive Plan | RSAs |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of RSAs that may be earned (in shares) |  |  |  |  | 780,825 |  |  |  |  |  |
2020 EBITDA goal | $ |  |  |  |  | $ 221,000,000 |  |  |  |  |  |
Maximum Performance | 2014 Incentive Plan | RSAs |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of RSAs that may be earned (in shares) |  |  |  |  | 1,171,238 |  |  |  |  |  |
Maximum Performance | 2014 Incentive Plan | RSAs | Executives and non-executive members of management |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Awarded (in shares) |  |  |  |  | 128,738 |  |  |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + 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=96867065&loc=d3e5070-113901 + Details
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- Definition Market valuation of entity divided by earnings before interest, taxes, depreciation, and amortization (EBITDA), used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + 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 number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&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=96867065&loc=d3e5070-113901 + Details
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