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Share-Based Payments (Tables) | 12 Months Ended
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Aug. 29, 2020
Share-Based Payments |
Weighted Average for Key Assumptions Used in Determining Fair Value of Options Granted and Related Share-Based Compensation Expense | The following table presents the weighted average for key assumptions used in determining the fair value of options granted and the related share-based compensation expense: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended |
​ |  | August 29, |  | August 31, |  | August 25, |
​ |  | 2020 | ​ | 2019 | ​ | 2018 | ​
Expected price volatility |  | 22 | % | 21 | % | 20 | %
Risk-free interest rate |  | 1.4 | % | 3.0 | % | 1.9 | %
Weighted average expected lives (in years) |  | 5.5 |  | 5.6 |  | 5.1 | ​
Forfeiture rate |  | 10 | % | 10 | % | 10 | %
Dividend yield |  | 0 | % | 0 | % | 0 | %
Stock Option Activity | The Company generally issues new shares when options are exercised. The following table summarizes information about stock option activity for the year ended August 29, 2020:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | Weighted |  | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Average | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Remaining | ​ | Aggregate
​ | ​ | ​ | ​ | Weighted | ​ | Contractual | ​ | Intrinsic
​ | ​ | Number | ​ | Average | ​ | Term | ​ | Value
​ | ​ | of Shares | ​ | Exercise Price | ​ | (in years) | ​ | (in thousands)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding – August 31, 2019 |  | 1,349,311 | ​ | $ | 601.36 |  |  |  | ​ |
Granted |  | 188,824 | ​ |  | 1,061.57 |  |  |  | ​ |
Exercised |  | (146,705) | ​ |  | 472.37 |  |  |  | ​ |
Cancelled |  | (6,444) | ​ |  | 735.42 |  |  |  | ​ |
Outstanding – August 29, 2020 |  | 1,384,986 | ​ |  | 677.15 |  | 5.82 | ​ | $ | 709,085
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Exercisable |  | 882,668 | ​ |  | 587.27 |  | 4.65 | ​ |  | 531,234
Expected to vest |  | 452,086 | ​ |  | 835.08 |  | 7.88 | ​ |  | 160,066
Available for future grants |  | 348,293 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​
Schedule of Nonvested Restricted Stock Units Activity | Transactions related to restricted stock units for the fiscal year ended August 29, 2020 are 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 |  | (441) | ​ |  | 942.76
Nonvested at August 29, 2020 |  | 14,160 | ​ | $ | 910.63

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