Stock-Based Awards - Stock Options (Details) - Stock Options	6 Months Ended
	Jan. 28, 2017 $ / 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	(48,543)
Canceled (in shares) | shares	(1,000)
Ending balance (in shares) | shares	724,638
Exercisable options (in shares) | shares	593,666
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	10.06
Canceled (in dollars per shares) | $ / shares	6.83
Ending balance (in dollars per shares) | $ / shares	24.67
Exercisable options (in dollars per shares) | $ / shares	$ 18.28