Receivables Securitization Program (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 25, 2020	Jan. 26, 2019	Jan. 25, 2020	Jan. 26, 2019	Apr. 27, 2019	Jul. 24, 2018
Transfers and Servicing [Abstract]
Eligible receivables, maximum available under Purchase Agreement						$ 200,000
Eligible Receivables, amount utilized under Purchase Agreement	$ 200,000		$ 200,000
DPP receivable	159,409		159,409		$ 57,238
Loss on sale of receivables	$ 1,468	$ 2,719	$ 5,013	$ 5,590