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Income Taxes - Significant Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jul. 29, 2017
Jul. 30, 2016
Deferred tax assets:    
Insurance and other reserves $ 36,955 $ 33,847
Allowance for doubtful accounts and reserves 1,975 1,013
Net operating loss carryforwards 765 1,151
Stock-based compensation 8,022 6,424
Other 1,750 1,363
Total deferred tax assets 49,467 43,798
Valuation allowance (122) (358)
Deferred tax assets, net of valuation allowance 49,345 43,440
Deferred tax liabilities:    
Property and equipment 87,581 63,926
Goodwill and intangibles 38,125 32,632
Other 741 736
Deferred tax liabilities 126,447 97,294
Net deferred tax liabilities $ 77,102 $ 53,854