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Stock Based Compensation - Previously Granted Deferred Stock (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 27, 2019 | Apr. 28, 2018 | Apr. 29, 2017
Previously Granted Deferred Stock Units |  |  |
Expense recognized | $ 11,320 | $ 9,879 | $ 10,551
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 | 100 | $ 200
Other long-term liabilities | Non-Employee Directors | Deferred Stock Units |  |  |
Previously Granted Deferred Stock Units |  |  |
Liability related to awards | $ 2,200 | $ 2,000 |

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