Fair Value Measurements - Level 3 Reconciliation (Details) $ in Thousands	12 Months Ended
	Apr. 27, 2019 USD ($)
Reconciliation of Level 3 assets recorded at fair value using significant unobservable inputs
Balance at beginning of the year	$ 10,954
Purchases	1,025
Balance at end of the year	11,979
Reconciliation of Level 3 liabilities recorded at fair value using significant unobservable inputs
Balance at beginning of the year	344
Acquisitions	7,500
Write-up, net	(74)
Translation adjustment	(18)
Balance at end of the year	$ 7,900