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Stock-Based Compensation - Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 28, 2018 | Apr. 27, 2019 | Apr. 28, 2018 | Apr. 29, 2017
Stock-Based Compensation |  |  |  |
Expense recognized |  | $ 11,320 | $ 9,879 | $ 10,551
Minimum |  |  |  |
Stock-Based Compensation |  |  |  |
Vesting period |  | 1 year |  |
Maximum |  |  |  |
Stock-Based Compensation |  |  |  |
Vesting period |  | 4 years |  |
Stock Options |  |  |  |
Stock-Based Compensation |  |  |  |
Vesting period |  | 10 months |  |
Cash received for exercises of stock options |  | $ 16,200 | $ 4,400 | 3,600
Number of Shares |  |  |  |
Outstanding at beginning of period (in shares) | 1,837,000 | 1,837,000 |  |
Granted (in shares) | 423,273 | 423,000 |  |
Canceled (in shares) |  | (58,000) |  |
Exercised (in shares) |  | (761,000) |  |
Outstanding at end of period (in shares) |  | 1,441,000 | 1,837,000 |
Exercisable (in shares) |  | 516,000 |  |
Weighted Average Exercise Price |  |  |  |
Outstanding at beginning of period (in dollars per share) | $ 24.18 | $ 24.18 |  |
Granted (in dollars per share) |  | 33.15 |  |
Canceled (in dollars per share) |  | 30.44 |  |
Exercised (in dollars per share) |  | 21.28 |  |
Outstanding at end of period (in dollars per share) |  | 28.09 | $ 24.18 |
Exercisable (in dollars per share) |  | $ 25.78 |  |
Additional information |  |  |  |
Weighted Average Remaining Contractual Term, Outstanding |  | 7 years 8 months 12 days | 7 years 4 months 24 days |
Weighted Average Remaining Contractual Term, Exercisable |  | 6 years 9 months 18 days |  |
Aggregate Intrinsic Value, Outstanding |  | $ 6,557 | $ 9,407 |
Aggregate Intrinsic Value, Exercised |  | 9,933 | $ 2,200 | $ 4,900
Aggregate Intrinsic Value, Exercisable |  | 3,450 |  |
Unrecognized compensation cost |  | $ 2,000 |  |
Period for recognition of unrecognized compensation costs |  | 1 year 8 months 12 days |  |
Vested during the period (in shares) |  | 500,000 |  |
Fair value assumptions |  |  |  |
Risk-free interest rate (as a percent) |  | 2.82% | 1.84% | 1.30%
Dividend rate (as a percent) |  | 1.45% | 1.61% | 1.54%
Expected life in years |  | 5 years | 5 years | 5 years
Stock price volatility (as a percent) |  | 33.07% | 32.12% | 38.87%
Fair value per share (in dollars per share) |  | $ 9.65 | $ 7.16 | $ 7.99
Stock Options | Minimum |  |  |  |
Stock-Based Compensation |  |  |  |
Purchase price of common stock at date of grant (as a percent) |  | 100.00% |  |
Stock Options | Selling, general and administrative expense |  |  |  |
Stock-Based Compensation |  |  |  |
Expense recognized |  | $ 3,500 | $ 4,200 | $ 3,400
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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested options awarded to employees as compensation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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