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Stock-Based Compensation - Previously Granted Deferred Stock (Details) - Non-Employee Directors - Deferred Stock Units - USD ($)
$ in Millions
Apr. 25, 2020
Apr. 27, 2019
Previously Granted Deferred Stock Units    
Award common share equivalent (in shares) 1  
Deferred stock units outstanding (in shares) 100,000  
Other long-term liabilities    
Previously Granted Deferred Stock Units    
Plan obligation included in other long-term liabilities $ 1.4 $ 2.2