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Debt (Details) - USD ($)
12 Months Ended
Apr. 25, 2020
Apr. 27, 2019
Apr. 28, 2018
Debt      
Short-term borrowings $ 75,000,000 $ 0  
Cash paid for interest 600,000 1,000,000.0 $ 400,000
Revolving credit facility      
Debt      
Excess availability 55,500,000 148,100,000  
Credit commitment $ 150,000,000.0 150,000,000.0  
Borrowings outstanding   $ 0