Stock-Based Awards - RSU's and Performance RSU's (Details)	6 Months Ended
	Jan. 23, 2016 $ / shares shares
RSUs
Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Outstanding [Roll Forward]
Beginning balance (in shares) | shares	322,008
Granted (in shares) | shares	82,043
Share units vested (in shares) | shares	(122,154)
Forfeited or canceled (in shares) | shares	(9,960)
Ending balance (in shares) | shares	271,937
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value [Roll Forward]
Beginning balance (in dollars per shares) | $ / shares	$ 24.46
Granted (in dollars per shares) | $ / shares	73.25
Share units vested (in dollars per shares) | $ / shares	23.55
Forfeited or canceled (in dollars per shares) | $ / shares	21.16
Ending balance (in dollars per shares) | $ / shares	$ 39.72
Performance RSUs
Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Outstanding [Roll Forward]
Beginning balance (in shares) | shares	945,540
Granted (in shares) | shares	238,209
Share units vested (in shares) | shares	(361,998)
Forfeited or canceled (in shares) | shares	(181,426)
Ending balance (in shares) | shares	640,325
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value [Roll Forward]
Beginning balance (in dollars per shares) | $ / shares	$ 26.46
Granted (in dollars per shares) | $ / shares	77.86
Share units vested (in dollars per shares) | $ / shares	25.28
Forfeited or canceled (in dollars per shares) | $ / shares	21.76
Ending balance (in dollars per shares) | $ / shares	$ 47.58