Receivables Securitization Program (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 27, 2019	Jul. 24, 2018
Transfers and Servicing [Abstract]
Accounts Receivable Securitization, Eligible Receivables, Amount Utilized Under Purchase Agreement	$ 166,000
Accounts Receivable Securitization, Eligible Receivables, Maximum Available Under Purchase Agreement		$ 200,000
Accounts Receivable from Securitization	57,238
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale, Gain (Loss) on Sale	$ (7,622)