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Stock-Based Compensation - Performance Awards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Apr. 30, 2016 | Apr. 25, 2015 | Apr. 26, 2014
Stock-Based Compensation |  |  |
Equity based compensation expenses | $ 9,647 | $ 11,377 | $ 14,475
Performance Awards |  |  |
Stock-Based Compensation |  |  |
Percentage of payout dependent on financial performance | 80.00% |  |
Percentage of payout dependent on total shareholder return | 20.00% |  |
Performance Awards | Minimum |  |  |
Stock-Based Compensation |  |  |
Performance award opportunity as a percentage of target award | 50.00% |  |
Performance Awards | Maximum |  |  |
Stock-Based Compensation |  |  |
Performance award opportunity as a percentage of target award | 200.00% |  |
Performance awards, performance period | 3 years |  |
Performance-Based Shares |  |  |
Stock-Based Compensation |  |  |
Equity based compensation expenses | $ 3,376 | 2,245 | 5,458
Unrecognized compensation cost | $ 4,600 |  |
Period for recognition of unrecognized compensation costs | 1 year 4 months 24 days |  |
Performance-Based Shares | Fiscal 2012 Grant |  |  |
Stock-Based Compensation |  |  |
Equity based compensation expenses |  |  | 3,603
Performance-Based Shares | Fiscal 2013 Grant |  |  |
Stock-Based Compensation |  |  |
Equity based compensation expenses |  | 568 | $ 849
Performance-Based Shares | Fiscal 2014 Grant |  |  |
Stock-Based Compensation |  |  |
Number of shares or units granted |  |  | 191
Number of shares or units earned | 159 |  |
Equity based compensation expenses | $ 926 | $ 769 | $ 1,006
Performance-Based Shares | Fiscal 2015 Grant |  |  |
Stock-Based Compensation |  |  |
Number of shares or units granted |  | 192 |
Number of shares or units earned | 64 |  |
Equity based compensation expenses | $ 840 | $ 908 |
Performance-Based Shares | Fiscal 2016 Grant |  |  |
Stock-Based Compensation |  |  |
Number of shares or units granted | 182 |  |
Number of shares or units earned | 80 |  |
Equity based compensation expenses | $ 1,610 |  |
Performance-Based Shares | Vesting Based on Performance | Fiscal 2014 Grant |  |  |
Stock-Based Compensation |  |  |
Fair value on date of grant (in dollars per share) |  |  | $ 18.58
Performance-Based Shares | Vesting Based on Performance | Fiscal 2015 Grant |  |  |
Stock-Based Compensation |  |  |
Fair value on date of grant (in dollars per share) |  | $ 22.91 |
Performance-Based Shares | Vesting Based on Performance | Fiscal 2016 Grant |  |  |
Stock-Based Compensation |  |  |
Fair value on date of grant (in dollars per share) | $ 25.73 |  |
Performance-Based Shares | Vesting Based on Market | Fiscal 2014 Grant |  |  |
Stock-Based Compensation |  |  |
Fair value on date of grant (in dollars per share) |  |  | $ 26.08
Performance-Based Shares | Vesting Based on Market | Fiscal 2015 Grant |  |  |
Stock-Based Compensation |  |  |
Fair value on date of grant (in dollars per share) |  | $ 29.64 |
Performance-Based Shares | Vesting Based on Market | Fiscal 2016 Grant |  |  |
Stock-Based Compensation |  |  |
Fair value on date of grant (in dollars per share) | $ 34.40 |  |
Performance-Based Units |  |  |
Stock-Based Compensation |  |  |
Equity based compensation expenses | $ 0 | $ 2,000 | $ 2,200
Performance-Based Units | Fiscal 2014 Grant |  |  |
Stock-Based Compensation |  |  |
Number of shares or units granted |  |  | 35
Number of shares or units earned | 24 |  |
Performance-Based Units | Vesting Based on Performance | Fiscal 2014 Grant |  |  |
Stock-Based Compensation |  |  |
Fair value (in dollars per unit) | $ 25.77 |  |
Performance-Based Units | Vesting Based on Market | Fiscal 2014 Grant |  |  |
Stock-Based Compensation |  |  |
Fair value (in dollars per unit) | $ 46.64 |  |

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- Definition The percentage of the payout for a performance share award that is based on the achievement of the total return that shareholders receive on their investment in the reporting entity's common stock relative to returns earned through investments in other public companies. + 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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