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Other Current Assets and Other Assets - Current (Details) - USD ($) $ in Thousands | Jan. 27, 2018 | Jul. 29, 2017 | Jul. 30, 2016
--- | --- | --- | ---
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |  |
Prepaid expenses | $ 13,167 | $ 10,588 | $ 8,249
Insurance recoveries for accrued insurance claims | 13,701 | 0 | 0
Receivables on equipment sales | 31 | 2,761 | 913
Deposits and other current assets, including restricted cash | 12,811 | 10,254 | 6,944
Total other current assets | 39,710 | 23,603 | 16,106
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Income tax receivable | $ 13,852 | $ 7,493 | 0
Other Current Assets |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Income tax receivable |  |  | $ 1,400

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