Share-Based Payments (Tables)

3 Months Ended

Nov. 19, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Weighted Average for Key Assumptions Used in Determining Fair Value of Options Granted and Related Share-Based Compensation Expense

The weighted average fair value of the stock option awards granted during the twelve week periods ended November 19, 2016, and November 21, 2015, using the Black-Scholes-Merton multiple-option pricing valuation model, was $139.66 and $155.88 per share, respectively, using the following weighted average key assumptions:

	Twelve Weeks Ended
	November 19, 2016			November 21, 2015
Expected price volatility		18	%		18	%
Risk-free interest rate		1.2	%		1.5	%
Weighted average expected lives (in years)		5.1			5.7
Forfeiture rate		10	%		10	%
Dividend yield		0	%		0	%