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Shareholders' Equity (Tables) | 12 Months Ended
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Apr. 28, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Expense Related to Equity Awards | The table below summarizes the expense related to the equity awards for fiscal 2018, 2017 and 2016.
|  | Compensation Expense
|  | Fiscal 2018 |  | Fiscal 2017 |  | Fiscal 2016
2014 Incentive Plan: |  |  |  |  |  |
RSAs |  | $ | (1.0 | ) |  | $ | 6.6 |  |  | $ | 3.6 |
RSUs |  | 5.0 |  |  | 5.5 |  |  | 2.8 |
Total 2014 Incentive Plan |  | 4.0 |  |  | 12.1 |  |  | 6.4 |
2010 Stock Plan: |  |  |  |  |  |
RSUs |  | — |  |  | 0.1 |  |  | 0.1 |
Stock Options |  | — |  |  | 0.1 |  |  | 0.3 |
Total 2010 Stock Plan |  | — |  |  | 0.2 |  |  | 0.4 |
2007 Stock Plan: |  |  |  |  |  |
Stock Options |  | — |  |  | 0.1 |  |  | 0.6 |
Total 2007 Stock Plan |  | — |  |  | 0.1 |  |  | 0.6 |
Total Compensation Expense |  | $ | 4.0 |  |  | $ | 12.4 |  |  | $ | 7.4 |
2014 Incentive Plan |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of Restricted Stock Awards and Restricted Stock Units Activity | The following table summarizes the RSA and RSU activity for fiscal 2016, fiscal 2017 and fiscal 2018 under the 2014 Incentive Plan:
| RSA Shares |  | RSU Shares
Unvested and Unissued at May 2, 2015 | — |  |  | — |
Awarded | 1,185,000 |  |  | 576,000 |
Vested | (24,000 | ) |  | — |
Forfeited and Canceled | — |  |  | — |
Unvested and Unissued at April 30, 2016 | 1,161,000 |  |  | 576,000 |
Awarded | 99,000 |  |  | 32,000 |
Vested | (27,000 | ) |  | (11,333 | )
Forfeited and Canceled | (64,500 | ) |  | (28,667 | )
Unvested and Unissued at April 29, 2017 | 1,168,500 |  |  | 568,000 |
Awarded | 152,738 |  |  | 30,925 |
Vested | (24,000 | ) |  | (160,553 | )
Forfeited and Canceled | (126,000 | ) |  | (56,000 | )
Unvested and Unissued at April 28, 2018 | 1,171,238 |  |  | 382,372 |
Schedule of Restricted Stock Awards and Restricted Stock Units by Grant Year and Vesting Period |
Grant Fiscal Year |  | Number of Shares Unvested |  | Vesting Period |  | Weighted Average Value |  | Probable Unearned Compensation Expense at April 28, 2018 |  | Target Unearned Compensation Expense at April 28, 2018
2016, 2017 and 2018 |  | 363,413 |  | (1) | Five-year RSA cliff, performance-based |  | $ | 34.11 |  |  | $ | 5.5 |  |  | $ | 11.0 |
2016, 2017 and 2018 |  | 382,372 |  |  | Five-year RSU, 30% in fiscal 2018, 30% in fiscal 2019 and 40% in fiscal 2020 |  | $ | 35.85 |  |  | $ | 5.1 |  |  | $ | 5.1 |
(1) RSA shares based on fiscal 2020 EBITDA threshold levels
2010 Stock Plan |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of Restricted Stock Awards and Restricted Stock Units Activity | The following table summarizes the RSA activity for fiscal years 2018, 2017 and 2016 under the 2010 Stock Plan:
|  | RSA Shares
Unvested and Unissued at May 2, 2015 |  | 66,667 |
Awarded |  | — |
Vested |  | (33,333 | )
Forfeited and Canceled |  | — |
Unvested and Unissued at April 30, 2016 |  | 33,334 |
Awarded |  | — |
Vested |  | (33,334 | )
Forfeited and Canceled |  | — |
Unvested and Unissued at April 29, 2017 |  | — |
Awarded |  | — |
Vested |  | — |
Forfeited and Canceled |  | — |
Unvested and Unissued at April 28, 2018 |  | — |
Summary of Stock Option Activity and Related Information for Stock Options Granted | The following tables summarize the stock option activity and related information for fiscal 2018, 2017 and 2016 for the stock options granted under the 2010 Stock Plan:
|  | Summary of Option Activity
|  | Shares |  | Wtd. Avg. Exercise Price
Outstanding at May 2, 2015 |  | 242,667 |  |  | $ | 24.50 |
Awarded |  | — |  |  | — |
Exercised |  | (18,668 | ) |  | 12.96 |
Canceled |  | (26,667 | ) |  | 32.07 |
Outstanding at April 30, 2016 |  | 197,332 |  |  | 24.55 |
Awarded |  | — |  |  | — |
Exercised |  | (125,332 | ) |  | 17.40 |
Canceled |  | — |  |  | — |
Outstanding at April 29, 2017 |  | 72,000 |  |  | 37.01 |
Awarded |  | — |  |  | — |
Exercised |  | — |  |  | — |
Canceled |  | — |  |  | — |
Outstanding at April 28, 2018 |  | 72,000 |  |  | $ | 37.01 |
Summary of Stock Option Activity and Related Information for Stock Options Granted, Options Outstanding and Exercisable |
Options Outstanding at April 28, 2018
Shares |  | Exercise Price |  | Avg. Remaining Life (Years)
72,000 |  |  | $ | 37.01 |  |  | 6.3
Options Exercisable at April 28, 2018
Shares |  | Exercise Price |  | Avg. Remaining Life (Years)
72,000 |  |  | $ | 37.01 |  |  | 6.3
Schedule of Estimated Fair Value of Stock Options on Date of Grant, Assumptions | We estimated the fair value of these stock options on the date of grant using the Black-Scholes option-pricing model with the following assumptions:
|  | 2010 Stock Plan
|  | Fiscal 2015 Awards
Average Expected Volatility |  | 51.00 | %
Average Risk-free Interest Rate |  | 1.00 | %
Dividend Yield |  | 1.66 | %
Expected Life of Options (in years) |  | 4.12 |
Weighted-average Grant-date Fair Value |  | $ | 14.99 |
2007 Stock Plan |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of Stock Option Activity and Related Information for Stock Options Granted | The following tables summarize the stock option activity and related information for the stock options granted under the 2007 Stock Plan for fiscal year 2018, 2017 and 2016:
|  | Summary of Option Activity
|  | Shares |  | Wtd. Avg. Exercise Price
Outstanding at May 2, 2015 |  | 108,000 |  |  | $ | 24.21 |
Awarded |  | — |  |  | — |
Exercised |  | (28,334 | ) |  | 10.99 |
Canceled |  | — |  |  | — |
Outstanding at April 30, 2016 |  | 79,666 |  |  | 28.91 |
Awarded |  | — |  |  | — |
Exercised |  | (22,497 | ) |  | 21.52 |
Canceled |  | — |  |  | — |
Outstanding at April 29, 2017 |  | 57,169 |  |  | 31.82 |
Awarded |  | — |  |  | — |
Exercised |  | (13,333 | ) |  | 24.67 |
Canceled |  | (1,668 | ) |  | 37.01 |
Outstanding at April 28, 2018 |  | 42,168 |  |  | $ | 33.87 |
Summary of Stock Option Activity and Related Information for Stock Options Granted, Options Outstanding and Exercisable |
Options Outstanding at April 28, 2018
Shares |  | Exercise Price |  | Avg. Remaining Life (Years)
5,000 |  |  | $ | 10.55 |  |  | 2.2
37,168 |  |  | $ | 37.01 |  |  | 6.3
42,168 |  |  | $ | 33.87 |  |  |
Options Exercisable at April 28, 2018
Shares |  | Exercise Price |  | Avg. Remaining Life (Years)
5,000 |  |  | $ | 10.55 |  |  | 2.2
37,168 |  |  | $ | 37.01 |  |  | 6.3
42,168 |  |  | $ | 33.87 |  |  |
Schedule of Estimated Fair Value of Stock Options on Date of Grant, Assumptions | We estimated the fair value of these stock options on the date of grant using the Black-Scholes option-pricing model with the following assumptions:
|  | Fiscal 2015 Awards
Average Expected Volatility |  | 51.00 | %
Average Risk-free Interest Rate |  | 1.00 | %
Dividend Yield |  | 1.66 | %
Expected Life of Options (in years) |  | 4.12 |
Weighted-average Grant-date Fair Value |  | $ | 14.99 |

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