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Share-Based Payments (Tables)
8 Months Ended
May 06, 2017
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 thirty-six week periods ended May 6, 2017, and May 7, 2016, using the Black-Scholes-Merton multiple-option pricing valuation model, was $139.80 and $156.20 per share, respectively, using the following weighted average key assumptions:

 

     Thirty-Six Weeks Ended  
     May 6,
2017
    May 7,
2016
 

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