Other Current Assets and Other Assets - Current (Details) - USD ($) $ in Thousands	Oct. 28, 2017	Jul. 29, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid expenses	$ 17,488	$ 10,588
Receivables on equipment sales	908	2,761
Deposits and other current assets	11,314	10,254
Total other current assets	$ 29,710	$ 23,603