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Share-Based Payments - Weighted Average for Key Assumptions Used in Determining Fair Value of Options Granted and Related Share-Based Compensation Expense (Detail)
12 Months Ended
Aug. 27, 2016
Aug. 29, 2015
Aug. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Expected price volatility 18.00% 20.00% 23.00%
Risk-free interest rates 1.50% 1.40% 1.00%
Weighted average expected lives (in years) 5 years 8 months 12 days 5 years 1 month 6 days 5 years 2 months 12 days
Forfeiture rate 10.00% 9.00% 9.00%
Dividend yield 0.00% 0.00% 0.00%