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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. 29, 2020
Aug. 31, 2019
Aug. 25, 2018
Share-Based Payments      
Expected price volatility 22.00% 21.00% 20.00%
Risk-free interest rate 1.40% 3.00% 1.90%
Weighted average expected lives (in years) 5 years 6 months 5 years 7 months 6 days 5 years 1 month 6 days
Forfeiture rate 10.00% 10.00% 10.00%
Dividend yield 0.00% 0.00% 0.00%