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Share-Based Payments (Tables) | 12 Months Ended
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Aug. 28, 2021
Share-Based Payments |
Schedule of Weighted Average for Key Assumptions Used in Determining Fair Value of Options Granted and Related Share-Based Compensation Expense |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended |
​ |  | August 28, | ​ | August 29, | ​ | August 31, |
​ |  | 2021 | ​ | 2020 | ​ | 2019 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Expected price volatility |  | 28 | % | 22 | % | 21 | %
Risk-free interest rate |  | 0.4 | % | 1.4 | % | 3.0 | %
Weighted average expected lives (in years) |  | 5.6 | ​ | 5.5 | ​ | 5.6 | ​
Forfeiture rate |  | 10 | % | 10 | % | 10 | %
Dividend yield |  | 0 | % | 0 | % | 0 | %
Schedule of 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 28, 2021:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | Weighted |  | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Average | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Remaining | ​ | Aggregate
​ | ​ | ​ | ​ | Weighted | ​ | Contractual | ​ | Intrinsic
​ | ​ | Number | ​ | Average | ​ | Term | ​ | Value
​ | ​ | of Shares | ​ | Exercise Price | ​ | (in years) | ​ | (in thousands)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding – August 29, 2020 |  | 1,384,986 | ​ | $ | 677.15 |  |  |  | ​ |
Granted |  | 202,820 | ​ |  | 1,152.54 |  |  |  | ​ |
Exercised |  | (349,592) | ​ |  | 541.80 |  |  |  | ​ |
Cancelled |  | (30,160) | ​ |  | 906.26 |  |  |  | ​ |
Outstanding – August 28, 2021 |  | 1,208,054 | ​ |  | 790.41 |  | 5.95 | ​ | $ | 915,807
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Exercisable |  | 766,453 | ​ |  | 669.30 |  | 4.68 | ​ |  | 673,858
Expected to vest |  | 397,441 | ​ |  | 1,000.60 |  | 8.16 | ​ |  | 217,754
Available for future grants |  | 1,188,220 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​
Schedule of Nonvested Restricted Stock Units Activity | Transactions related to restricted stock units for the fiscal year ended August 28, 2021 are as follows:
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted-
​ |  | Number |  | Average Grant
​ | ​ | of Shares | ​ | Date Fair Value
​ | ​ | ​ | ​ | ​ | ​
Nonvested at August 29, 2020 |  | 14,160 | ​ | $ | 910.63
Granted |  | 8,064 | ​ | ​ | 1,149.77
Vested |  | (5,805) | ​ |  | 977.48
Canceled or forfeited |  | (668) | ​ |  | 976.36
Nonvested at August 28, 2021 |  | 15,751 | ​ | $ | 1,005.41

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