Other Income, Net (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jan. 27, 2018	Jan. 28, 2017	Jan. 26, 2019	Jul. 29, 2017	Jul. 30, 2016
Other Income and Expenses [Abstract]
Gain on sale of fixed assets	$ 7,217		$ 19,390	$ 14,866	$ 9,806
Miscellaneous expense, net	(992)		(3,392)	(2,086)	627
Write off of Deferred Debt Issuance Cost	0		(156)	0	0
Total other income, net	6,225	$ 1,946	15,842	12,780	10,433
Financial Service, Other
Net Investment Income
Other financial services costs	$ 1,400		$ 4,100	$ 3,200	$ 200