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Stock-Based Awards - Tax Benefit Recognized (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jan. 28, 2017
Jan. 23, 2016
Jan. 28, 2017
Jan. 23, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Stock-based compensation $ 5,309 $ 4,200 $ 11,015 $ 8,708
Related tax benefit for stock-based compensation $ 2,000 $ 1,613 $ 4,183 $ 3,342