Share-Based Payments - Stock Option Activity (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Aug. 26, 2017 USD ($) $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Outstanding, Beginning balance, Number of Shares	1,759,408
Granted, Number of Shares	290,805
Exercised, Number of Shares	(207,069)
Cancelled, Number of Shares	(45,089)
Outstanding, Ending balance, Number of Shares	1,798,055
Exercisable, Number of Shares	1,041,933
Expected to vest, Number of Shares	680,510
Available for future grants, Number of Shares	898,992
Outstanding, Beginning balance, Weighted Average Exercise Price | $ / shares	$ 428.72
Granted, Weighted Average Exercise Price | $ / shares	744.80
Exercised, Weighted Average Exercise Price | $ / shares	263.02
Cancelled, Weighted Average Exercise Price | $ / shares	657.78
Outstanding, Ending balance, Weighted Average Exercise Price | $ / shares	493.18
Exercisable, Weighted Average Exercise Price | $ / shares	362.38
Expected to vest, Weighted Average Exercise Price | $ / shares	$ 673.42
Outstanding , Weighted-Average Remaining Contractual Term	6 years 2 months 1 day
Exercisable, Weighted-Average Remaining Contractual Term	4 years 9 months 3 days
Expected to vest, Weighted-Average Remaining Contractual Term	8 years 1 month 6 days
Outstanding, Aggregate Intrinsic Value | $	$ 199,752
Exercisable, Aggregate Intrinsic Value | $	189,790
Expected to vest, Aggregate Intrinsic Value | $	$ 8,966