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Fair Value Measurements - Level 3 Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 24, 2021
Apr. 25, 2020
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of the year $ 6,479 $ 11,979
Purchases   500
Write-off   (6,000)
Fair value adjustment 14,100  
Balance at end of the year 7,579 6,479
Fair Value, Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of the year 0 7,900
Write-off   (7,900)
Fair value adjustment 0  
Balance at end of the year $ 14,100 $ 0