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Stock-Based Compensation - Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 29, 2017 | Apr. 28, 2018 | Apr. 29, 2017 | Apr. 30, 2016
Stock-Based Compensation |  |  |  |
Expense recognized |  | $ 9,879 | $ 10,551 | $ 9,647
Stock Options |  |  |  |
Stock-Based Compensation |  |  |  |
Cash received for exercises of stock options |  | $ 4,400 | $ 3,600 | 400
Number of Shares |  |  |  |
Outstanding at beginning of period (in shares) | 1,509,000 | 1,509,000 |  |
Granted (in shares) | 573,591 | 574,000 |  |
Canceled (in shares) |  | (40,000) |  |
Exercised (in shares) |  | (206,000) |  |
Outstanding at end of period (in shares) |  | 1,837,000 | 1,509,000 |
Exercisable (in shares) |  | 732,000 |  |
Weighted Average Exercise Price |  |  |  |
Outstanding at beginning of period (in dollars per share) | $ 22.70 | $ 22.70 |  |
Granted (in dollars per share) |  | 27.25 |  |
Canceled (in dollars per share) |  | 26.58 |  |
Exercised (in dollars per share) |  | 21.40 |  |
Outstanding at end of period (in dollars per share) |  | 24.18 | $ 22.70 |
Exercisable (in dollars per share) |  | $ 20.57 |  |
Additional information |  |  |  |
Weighted Average Remaining Contractual Term, Outstanding |  | 7 years 4 months 24 days | 7 years 7 months 6 days |
Weighted Average Remaining Contractual Term, Exercisable |  | 5 years 10 months 24 days |  |
Aggregate Intrinsic Value, Outstanding |  | $ 9,407 | $ 7,638 |
Aggregate Intrinsic Value, Exercised |  | 2,152 | $ 4,900 | $ 600
Aggregate Intrinsic Value, Exercisable |  | 6,388 |  |
Unrecognized compensation cost |  | $ 1,900 |  |
Period for recognition of unrecognized compensation costs |  | 1 year 6 months |  |
Vested during the period (in shares) |  | 400,000 |  |
Fair value assumptions |  |  |  |
Risk-free interest rate (as a percent) |  | 1.84% | 1.30% | 1.54%
Dividend rate (as a percent) |  | 1.61% | 1.54% | 1.20%
Expected life in years |  | 5 years | 5 years | 5 years
Stock price volatility (as a percent) |  | 32.12% | 38.87% | 44.37%
Fair value per share (in dollars per share) |  | $ 7.16 | $ 7.99 | $ 9.69
Stock Options | Minimum |  |  |  |
Stock-Based Compensation |  |  |  |
Purchase price of common stock at date of grant (as a percent) |  | 100.00% |  |
Vesting period |  | 1 year |  |
Stock Options | Maximum |  |  |  |
Stock-Based Compensation |  |  |  |
Vesting period |  | 4 years |  |
Stock Options | Selling, general and administrative expense |  |  |  |
Stock-Based Compensation |  |  |  |
Expense recognized |  | $ 4,200 | $ 3,400 | $ 3,200
Stock Options | Former Long-Term Equity Award Plan |  |  |  |
Stock-Based Compensation |  |  |  |
Award expiration term |  | 10 years |  |

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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 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 Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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