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Fair Value Measurements - Level 3 Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 25, 2020
Apr. 27, 2019
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of the year $ 11,979 $ 10,954
Purchases 500 1,025
Write-off (6,000)  
Balance at end of the year 6,479 11,979
Fair Value, Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of the year 7,900 344
Acquisitions   7,500
Write-up, net   74
Translation adjustment   (18)
Write-off (7,900)  
Balance at end of the year $ 0 $ 7,900