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Share-Based Payments (Tables) | 3 Months Ended
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Nov. 23, 2019
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 aver a ge fair value of the stock option awards granted during the twelve week periods ended November 23 , 2019 and November 17, 2018, using the Black-Scholes-Merton multiple-option pricing valuation model, was $252.39 and $208.31 per share, respectively, using the following weighted average key assumptions:
|  | Twelve Weeks Ended |
|  |  | November 23, 2019 |  |  | November 17, 2018 |
Expected price volatility |  |  | 22 | % |  |  | 21 | % |
Risk-free interest rate |  |  | 1.4 | % |  |  | 3.1 | % |
Weighted average expected lives (in years) |  |  | 5.5 |  |  |  | 5.6 |  |
Forfeiture rate |  |  | 10 | % |  |  | 10 | % |
Dividend yield |  |  | 0 | % |  |  | 0 | % |
Schedule of Nonvested Restricted Stock Units Activity | Transactions related to restricted stock units for the twelve weeks ended November 23, 2019 were as follow s :
|  |  | Number of Shares |  |  |  |  | Weighted - Average Grant Date Fair Value |  |
Nonvested at August 31, 2019 |  |  |  | 10,049 |  |  |  |  | $ | 773.61 |  |
Granted |  |  |  | 7,008 |  |  |  |  |  | 1,060.81 |  |
Vested |  |  |  | (2,456 | ) |  |  |  |  | 772.80 |  |
Canceled or forfeited |  |  |  | (66 | ) |  |  |  |  | 772.80 |  |
Nonvested at November 23, 2019 |  |  |  | 14,535 |  |  |  |  | $ | 912.23 |  |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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