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Stock-Based Awards - Stock Options (Details) - Stock Options
 3 Months Ended
Oct. 24, 2015
$ / shares
shares
Stock Options, Outstanding [Roll Forward]  
Beginning balance (in shares) 915,323
Options exercised (in shares) (12,788)
Canceled (in shares) (800)
Ending balance (in shares) 901,735
Exercisable options (in shares) 643,467
Stock Options, Outstanding, Weighted Average Exercise Price [Roll Forward]  
Beginning balance (in dollars per shares) | $ / shares $ 16.86
Options exercised (in dollars per shares) | $ / shares 10.84
Canceled (in dollars per shares) | $ / shares 13.88
Ending balancez (in dollars per shares) | $ / shares 16.95
Exercisable options (in dollars per shares) | $ / shares $ 13.52