Other Current Assets and Other Assets - Non-current (Details) - USD ($) $ in Thousands	Jan. 27, 2018	Jul. 29, 2017	Jul. 30, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred financing costs	$ 3,873	$ 4,797	$ 6,366
Restricted cash	5,253	5,408	5,008
Insurance recoveries for accrued insurance claims	6,722	9,243	5,714
Other non-current deposits and assets	12,342	13,925	16,688
Total other assets	$ 28,190	$ 33,373	$ 33,776