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Stock Based Compensation - Previously Granted Deferred Stock (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 29, 2017 | Apr. 30, 2016 | Apr. 25, 2015
Previously Granted Deferred Stock Units |  |  |
Expense recognized | $ 10,551 | $ 9,647 | $ 11,377
Non-Employee Directors | Deferred Stock Units |  |  |
Previously Granted Deferred Stock Units |  |  |
Award common share equivalent (in shares) | 1 |  |
Deferred stock units outstanding (in shares) | 100,000 |  |
Non-Employee Directors | Deferred Stock Units | Selling, General and Administrative Expense |  |  |
Previously Granted Deferred Stock Units |  |  |
Expense recognized | $ 200 | (200) | $ 400
Other long-term liabilities | Non-Employee Directors | Deferred Stock Units |  |  |
Previously Granted Deferred Stock Units |  |  |
Liability related to awards | $ 1,900 | $ 2,600 |

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