Derivative Financial Instruments - Effect of Interest Rate Contracts and Interest Rate Swaps on Consolidated Statements of Income and Other Comprehensive Income (Details) - Interest rate contracts - USD ($) $ in Thousands	12 Months Ended
	Apr. 27, 2019	Apr. 28, 2018	Apr. 29, 2017
Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) reclassified form Accumulated Other Comprehensive Loss	$ (2,908)	$ (2,809)	$ (2,802)
Other income, net
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives not designated as hedging instruments gain (loss) recognized in income	$ (2,903)	$ 0	$ 0