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Share-Based Payments (Tables) | 6 Months Ended
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Feb. 15, 2020
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 twenty-four week periods ended February 15, 2020 and February 9, 2019, using the Black-Scholes-Merton multiple-option pricing valuation model, was $252.39 and $208.33 per share, respectively, using the following weighted average key assumptions:
|  | Twenty-Four Weeks Ended
|  | February 15, 2020 |  | February 9, 2019 |
Expected price volatility |  |  | 22% |  |  |  | 21% |
Risk-free interest rate |  |  | 1.4% |  |  |  | 3.0% |
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 twenty-four weeks ended February 15, 2020 were as follows:
|  | Number of Shares |  |  | Weighted-Average Grant Date Fair Value |
Nonvested at August 31, 2019 |  |  | 10,049 |  |  | $ | 773.61 |
Granted |  |  | 8,735 |  |  |  | 1,086.61 |
Vested |  |  | (4,183 | ) |  |  | 945.58 |
Canceled or forfeited |  |  | (165 | ) |  |  | 929.33 |
Nonvested at February 15, 2020 |  |  | 14,436 |  |  | $ | 911.39 |

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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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