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Shareholders' Equity (Tables) | 12 Months Ended
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Apr. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Stock by Class | The number of shares of common stock, par value $0.50 per share, authorized, issued and outstanding and in treasury, was as follows:
| April 30, 2016 |  | May 2, 2015
Authorized | 100,000,000 |  |  | 100,000,000 |
Issued and outstanding | 38,181,985 |  |  | 39,702,036 |
In treasury | 1,346,624 |  |  | 1,346,624 |
Schedule of Expense Related to Equity Awards | The table below summarizes the expense related to the equity awards for fiscal 2016, 2015 and 2014.
| Compensation Expense
| Fiscal 2016 |  | Fiscal 2015 |  | Fiscal 2014
2014 Incentive Plan: |  |  |  |  |
RSAs | $3.6 |  | $0.5 |  | $0.0
RSUs | 2.8 |  |  | — |  |  | — |
Total 2014 Incentive Plan | $6.4 |  | $0.5 |  | $0.0
2010 Stock Plan: |  |  |  |  |
RSAs | $0.0 |  | $1.5 |  | $1.5
RSUs | 0.1 |  |  | 0.1 |  |  | 0.3 |
Stock options | 0.3 |  |  | 1.2 |  |  | 0.8 |
Total 2010 Stock Plan | $0.4 |  | $2.8 |  | $2.6
2007 Stock Plan: |  |  |  |  |
RSAs | $0.0 |  | $0.5 |  | $0.4
Stock options | 0.6 |  |  | 0.5 |  |  | 0.3 |
Total 2007 Stock Plan | $0.6 |  | $1.0 |  | $0.7
Total Compensation Expense | $7.4 |  | $4.3 |  | $3.3
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 2015 and fiscal 2016 under the 2014 Incentive Plan:
| RSA Shares |  | RSU Shares
Unvested and unissued at May 3, 2014 | — |  |  | — |
Awarded | 13,500 |  |  | — |
Vested | (13,500 | ) |  | — |
Forfeited and Cancelled | — |  |  | — |
Unvested and unissued at May 2, 2015 | — |  |  | — |
Awarded | 1,185,000 |  |  | 576,000 |
Vested | (24,000 | ) |  | — |
Forfeited and Cancelled | — |  |  | — |
Unvested and unissued at April 30, 2016 | 1,161,000 |  |  | 576,000 |
Schedule of Restricted Stock Awards and Restricted Stock Units by Grant Year and Vesting Period |
|  |  |  |  |  | Weighted Average Value |  | Probable Unearned Compensation Expense at April 30, 2016 |  | Target Unearned Compensation Expense at April 30, 2016
Grant Fiscal Year |  | Number of Shares Granted |  | Vesting Period |  |  |
2016 |  | 774,000 |  | (1) | Five-year RSA cliff, performance-based |  | $ | 31.98 |  |  | $ | 21.9 |  |  | $ | 21.9 |
2016 |  | 576,000 |  |  | Five-year RSU, 30% in fiscal 2018, 30% in fiscal 2019 and 40% in fiscal 2020 |  | $ | 32.02 |  |  | $ | 15.6 |  |  | $ | 15.6 |
(1) RSA shares based on fiscal 2020 EBITDA target 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 and RSU activity for fiscal year 2016, 2015 and 2014 under the 2010 Stock Plan:
| RSA Shares |  | RSU Shares
Unvested and unissued at April 27, 2013 | 700,000 |  |  | 120,000 |
Awarded | — |  |  | — |
Vested | — |  |  | (60,000 | )
Forfeited and Cancelled | — |  |  | — |
Unvested and unissued at May 3, 2014 | 700,000 |  |  | 60,000 |
Awarded | — |  |  | — |
Vested | (633,333 | ) |  | (60,000 | )
Forfeited and Cancelled | — |  |  | — |
Unvested and unissued at May 2, 2015 | 66,667 |  |  | — |
Awarded | — |  |  | — |
Vested | (33,333 | ) |  | — |
Forfeited and Cancelled | — |  |  | — |
Unvested and unissued at April 30, 2016 | 33,334 |  |  | — |
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 2010 Stock Plan for fiscal 2016, 2015 and 2014:
|  | Summary of Option Activity
|  | Shares |  | Wtd. Avg. Exercise Price
Outstanding April 27, 2013 |  | 360,000 |  |  | $9.53
Awarded |  | 120,000 |  |  | 17.27 |
Exercised |  | (59,999 | ) |  | 9.50 |
Cancelled |  | — |  |  | — |
Outstanding May 3, 2014 |  | 420,001 |  |  | $11.75
Awarded |  | 108,000 |  |  | 37.01 |
Exercised |  | (285,334 | ) |  | 10.47 |
Cancelled |  | — |  |  | — |
Outstanding May 2, 2015 |  | 242,667 |  |  | $24.50
Awarded |  | — |  |  | — |
Exercised |  | (18,668 | ) |  | 12.96 |
Cancelled |  | (26,667 | ) |  | 32.07 |
Outstanding April 30, 2016 |  | 197,332 |  |  | $24.55
Summary of Stock Option Activity and Related Information for Stock Options Granted, Options Outstanding and Exercisable |
Options Outstanding at April 30, 2016
Shares |  | Exercise Price |  | Avg. Remaining Life (Years)
5,333 |  |  | $10.70 |  | 5.3
30,666 |  |  | $8.64 |  | 6.3
73,333 |  |  | $17.27 |  | 7.3
88,000 |  |  | $37.01 |  | 8.3
197,332 |  |  | $24.55 |  |
Options Exercisable at April 30, 2016
Shares |  | Exercise Price |  | Avg. Remaining Life (Years)
5,333 |  |  | $10.70 |  | 5.3
30,666 |  |  | $8.64 |  | 6.3
33,333 |  |  | $17.27 |  | 7.3
16,000 |  |  | $37.01 |  | 8.3
85,332 |  |  | $17.46 |  |
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 |  | Fiscal 2014 |
| Awards |  | Awards |
Average expected volatility | 51.00 | % |  | 65.33 | % |
Average risk-free interest rate | 1.00 | % |  | 0.65 | % |
Dividend yield | 1.66 | % |  | 2.81 | % |
Expected life of options (in years) | 4.12 |  |  | 7.61 |  |
Weighted-average grant-date fair value | $ | 14.99 |  |  | $ | 8.39 |  |
2007 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 under the 2007 Stock Plan:
| Fiscal 2016 |  | Fiscal 2015 |  | Fiscal 2014
Unvested at beginning of fiscal year | — |  |  | — |  |  | — |
Awarded | — |  |  | 13,500 |  |  | 27,000 |
Vested | — |  |  | (13,500 | ) |  | (27,000 | )
Forfeited | — |  |  | — |  |  | — |
Unvested at end of period | — |  |  | — |  |  | — |
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 2016, 2015 and 2014:
| Summary of Option Activity
| Shares |  | Wtd. Avg. Exercise Price
Outstanding at April 27, 2013 | 778,000 |  |  | $5.94
Awarded | 42,500 |  |  | 17.27 |
Exercised | (648,141 | ) |  | 5.60 |
Cancelled | — |  |  | — |
Outstanding at May 3, 2014 | 172,359 |  |  | $10.02
Awarded | 50,500 |  |  | 37.01 |
Exercised | (114,859 | ) |  | 8.55 |
Cancelled | — |  |  | — |
Outstanding at May 2, 2015 | 108,000 |  |  | $24.21
Awarded | — |  |  | — |
Exercised | (28,334 | ) |  | 10.99 |
Cancelled | — |  |  | — |
Outstanding at April 30, 2016 | 79,666 |  |  | $28.91
Summary of Stock Option Activity and Related Information for Stock Options Granted, Options Outstanding and Exercisable | Options Outstanding at April 30, 2016
Shares |  | Exercise Price |  | Avg. Remaining Life (Years)
5,000 |  |  | $10.55 |  | 4.3
4,166 |  |  | $8.64 |  | 6.3
20,000 |  |  | $17.27 |  | 7.3
50,500 |  |  | $37.01 |  | 8.3
79,666 |  |  | $28.91 |  |
Options Exercisable at April 30, 2016
Shares |  | Exercise Price |  | Avg. Remaining Life (Years)
5,000 |  |  | $10.55 |  | 4.3
4,166 |  |  | $8.64 |  | 6.3
5,834 |  |  | $17.27 |  | 7.3
16,833 |  |  | $37.01 |  | 8.3
31,833 |  |  | $25.52 |  |
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 |  | Fiscal 2014 Awards |
Average expected volatility | 51.00 | % |  | 65.33 | % |
Average risk-free interest rate | 1.00 | % |  | 0.65 | % |
Dividend yield | 1.66 | % |  | 2.81 | % |
Expected life of options | 4.12 years |  |  | 7.61 years |  |
Weighted-average grant-date fair value | $ | 14.99 |  |  | $ | 8.39 |  |

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- Definition Tabular disclosure of an entity's stock, including par or stated value per share, number and dollar amount of share subscriptions, shares authorized, shares issued, shares outstanding, number and dollar amount of shares held in an employee trust, dividend per share, total dividends, share conversion features, par value plus additional paid in capital, the value of treasury stock and other information necessary to a fair presentation, and EPS information. Stock by class includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued, and outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65877616&loc=d3e177068-122764 Reference 3: 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(d)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21553-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65888546&loc=d3e21300-112643 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(27)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 + Details
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