Other Current Assets and Other Assets - Current (Details) - USD ($) $ in Thousands	Jan. 25, 2020	Jan. 26, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid expenses	$ 12,769	$ 12,758
Deposits and other current assets	17,447	14,762
Restricted cash	1,556	1,556
Receivables on equipment sales	219	69
Other current assets	$ 31,991	$ 29,145