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Stock-Based Awards - Stock Options (Details) - Stock Options
$ / shares in Units, $ in Thousands
 12 Months Ended
Jul. 29, 2017
USD ($)
$ / shares
shares
Stock Options, Outstanding [Roll Forward]  
Beginning balance (in shares) | shares 737,267
Granted (in shares) | shares 36,914
Options exercised (in shares) | shares (102,831)
Canceled (in shares) | shares (1,000)
Ending balance (in shares) | shares 670,350
Exercisable options (in shares) | shares 539,378
Stock Options, Outstanding, Weighted Average Exercise Price [Roll Forward]  
Beginning balance (in dollars per shares) | $ / shares $ 20.99
Options granted (in dollars per shares) | $ / shares 78.46
Options exercised (in dollars per shares) | $ / shares 14.09
Canceled (in dollars per shares) | $ / shares 6.83
Ending balance (in dollars per shares) | $ / shares 25.24
Weighted average remaining contractual life, shares exercisable (In years) | $ / shares $ 18.34
Weighted Average Remaining Contractual Life (In years)  
Weighted average remaining contractual life, shares outstanding (In years) 4 years 11 months 1 day
Weighted average remaining contractual life, shares exercisable (In years) 4 years 2 months 1 day
Aggregate intrinsic value share outstanding | $ $ 43,614
Aggregate intrinsic value share exercisable | $ $ 38,812