Stock-Based Awards - Stock Options (Details) - Stock Options	3 Months Ended
	Oct. 29, 2016 $ / shares shares
Stock Options, Outstanding [Roll Forward]
Beginning balance (in shares) | shares	737,267
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares	0
Options exercised (in shares) | shares	(22,284)
Canceled (in shares) | shares	(1,000)
Ending balance (in shares) | shares	713,983
Exercisable options (in shares) | shares	530,211
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	0.00
Options exercised (in dollars per shares) | $ / shares	9.08
Canceled (in dollars per shares) | $ / shares	6.83
Ending balance (in dollars per shares) | $ / shares	21.39
Exercisable options (in dollars per shares) | $ / shares	$ 15.92