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Stock Based Compensation - Previously Granted Deferred Stock (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2016 | Apr. 25, 2015 | Apr. 26, 2014
Previously Granted Deferred Stock Units |  |  |
Expense recognized | $ 9,647 | $ 11,377 | $ 14,475
Directors | Deferred Stock Units |  |  |
Previously Granted Deferred Stock Units |  |  |
Award common share equivalent (in shares) | 1 |  |
Deferred stock units outstanding (in shares) | 100,000 |  |
Directors | Deferred Stock Units | Selling, General and Administrative Expense |  |  |
Previously Granted Deferred Stock Units |  |  |
Expense recognized | $ (200) | 400 | $ 800
Other long-term liabilities | Directors | Deferred Stock Units |  |  |
Previously Granted Deferred Stock Units |  |  |
Liability related to awards | $ 2,600 | $ 3,400 |

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