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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Jan. 27, 2018 | Jul. 29, 2017 | Jul. 30, 2016
--- | --- | --- | ---
Deferred tax assets: |  |  |
Insurance and other reserves | $ 22,368 | $ 36,955 | $ 33,847
Allowance for doubtful accounts and reserves | 1,081 | 1,975 | 1,013
Net operating loss carryforwards | 822 | 765 | 1,151
Stock-based compensation | 3,405 | 8,022 | 6,424
Other | 1,174 | 1,750 | 1,363
Total deferred tax assets | 28,850 | 49,467 | 43,798
Valuation allowance | (148) | (122) | (358)
Deferred tax assets, net of valuation allowance | 28,702 | 49,345 | 43,440
Deferred tax liabilities: |  |  |
Property and equipment | 59,933 | 87,581 | 63,926
Goodwill and intangibles | 25,852 | 38,125 | 32,632
Other | 345 | 741 | 736
Deferred tax liabilities | 86,130 | 126,447 | 97,294
Net deferred tax liabilities | $ 57,428 | $ 77,102 | $ 53,854

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