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Stock-Based Compensation - SARs (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Apr. 29, 2017 | Apr. 30, 2016 | Apr. 25, 2015
Stock-Based Compensation |  |  |
Expense recognized | $ 10,551 | $ 9,647 | $ 11,377
Stock Appreciation Rights |  |  |
Stock-Based Compensation |  |  |
Percentage vesting each year from date of grant | 25.00% |  |
Period from grant date for first vesting | 1 year |  |
Vesting period | 4 years |  |
Unrecognized compensation cost | $ 0 |  |
Stock Appreciation Rights | Fiscal 2014 Grant |  |  |
Fair value assumptions |  |  |
Risk-free interest rate (as a percent) | 1.04% |  |
Dividend rate (as a percent) | 1.58% |  |
Expected life in years | 1 year 1 month 17 days |  |
Stock price volatility (as a percent) | 31.29% |  |
Fair value per share (in dollars per share) | $ 9.06 |  |
Stock Appreciation Rights | Fiscal 2013 Grant |  |  |
Fair value assumptions |  |  |
Risk-free interest rate (as a percent) | 0.81% |  |
Dividend rate (as a percent) | 1.58% |  |
Expected life in years | 2 months 16 days |  |
Stock price volatility (as a percent) | 21.91% |  |
Fair value per share (in dollars per share) | $ 15.86 |  |
Stock Appreciation Rights | Selling, General and Administrative Expense |  |  |
Stock-Based Compensation |  |  |
Expense recognized | $ 700 | $ 100 | $ 700

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- Definition Period from date of grant for first vesting of the award. + References No definition available. + Details
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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=6415400&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=6415400&loc=d3e5070-113901 + Details
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- Definition Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price). + 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 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=6415400&loc=d3e5070-113901 + Details
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