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Share-Based Payments (Tables) | 8 Months Ended
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May 09, 2020
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 9, 2020 and May 4, 2019, using the Black-Scholes-Merton multiple-option pricing valuation model, was $252.39 and $208.37 per share, respectively, using the following weighted average key assumptions: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Thirty-Six Weeks Ended | ​
​ | ​ | May 9, | ​ | May 4, | ​
​ | ​ | 2020 | ​ | 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 thirty-six weeks ended May 9, 2020 were as follows: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted-
​ |  | Number |  | Average Grant
​ | ​ | of Shares | ​ | 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 |  | (313) | ​ |  | 938.64
Nonvested at May 9, 2020 |  | 14,288 | ​ | $ | 911.01

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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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