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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)
3 Months Ended
Nov. 21, 2020
Nov. 23, 2019
Share-Based Payments    
Expected price volatility 28.00% 22.00%
Risk-free interest rate 0.40% 1.40%
Weighted average expected lives (in years) 5 years 7 months 6 days 5 years 6 months
Forfeiture rate 10.00% 10.00%
Dividend yield 0.00% 0.00%