Share-Based Payments (Tables)

3 Months Ended

Nov. 21, 2015

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 21, 2015, and November 22, 2014, using the Black-Scholes-Merton multiple-option pricing valuation model, was $155.88 and $104.66 per share, respectively, using the following weighted average key assumptions:

	Twelve Weeks Ended
	November 21, 2015			November 22, 2014
Expected price volatility		18	%		20	%
Risk-free interest rate		1.5	%		1.4	%
Weighted average expected lives (in years)		5.7			5.0
Forfeiture rate		10	%		9	%
Dividend yield		0	%		0	%