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Share-Based Payments | 3 Months Ended
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Nov. 21, 2020
Share-Based Payments |
Share-Based Payments | Note B – Share-Based Payments AutoZone maintains several equity incentive plans, which provide equity-based compensation to non-employee directors and eligible employees for their service to AutoZone, its subsidiaries or affiliates. The Company recognizes compensation expense for share-based payments based on the fair value of the awards at the grant date. Share-based payments include stock option grants, restricted stock grants, restricted stock unit grants, stock appreciation rights, discounts on shares sold to employees under share purchase plans and other awards. Additionally, directors’ fees are paid in restricted stock units with value equivalent to the value of shares of common stock as of the grant date. The change in fair value of liability-based stock awards is also recognized in share-based compensation expense. Stock Options: The Company made stock option grants of 194,511 shares during the twelve week period ended November 21, 2020 and granted options to purchase 188,324 shares during the comparable prior year period. The Company grants options to purchase common stock to certain of its employees under its plan at prices equal to the market value of the stock on the date of grant. The fair value of each option is amortized into compensation expense on a straight-line basis between the grant date for the award and each vesting date. ​ The weighted average fair value of the stock option awards granted during the twelve week periods ended November 21, 2020 and November 23, 2019, using the Black-Scholes-Merton multiple-option pricing valuation model, was $299.48 and $252.39 per share, respectively, using the following weighted average key assumptions: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Twelve Weeks Ended
​ |  | November 21, |  | November 23, |
​ |  | 2020 | ​ | 2019 | ​
​ | ​ | ​ | ​ | ​ | ​
Expected price volatility |  | 28 | % | 22 | %
Risk-free interest rate |  | 0.4 | % | 1.4 | %
Weighted average expected lives (in years) |  | 5.6 |  | 5.5 |
Forfeiture rate |  | 10 | % | 10 | %
Dividend yield |  | 0 | % | 0 | %
​ During the twelve week period ended November 21, 2020, 59,990 stock options were exercised at a weighted average exercise price of $496.58. In the comparable prior year period, 18,407 stock options were exercised at a weighted average exercise price of $568.16. Restricted Stock Units: Restricted stock unit awards are valued at the market price of a share of the Company’s stock on the date of grant. Grants of employee restricted stock units vest ratably on an annual basis over a four-year service period and are payable in shares of common stock on the vesting date. Compensation expense for grants of employee restricted stock units is recognized on a straight-line basis over the four-year service period, less estimated forfeitures, which are consistent with stock option forfeiture assumptions. Grants of non-employee director restricted stock units are made and expensed on January 1 of each year, as they vest immediately. As of November 21, 2020, total unrecognized stock-based compensation expense related to nonvested restricted stock unit awards, net of estimated forfeitures, was approximately $14.5 million, before income taxes, which we expect to recognize over an estimated weighted average period of 3.1 years. Transactions related to restricted stock units for the twelve weeks ended November 21, 2020 were as follows: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted-
​ |  | Number |  | Average Grant
​ | ​ | of Shares | ​ | Date Fair Value
​ | ​ | ​ | ​ | ​ | ​
Nonvested at August 29, 2020 |  | 14,160 | ​ | $ | 910.63
Granted |  | 6,328 | ​ | ​ | 1,139.99
Vested |  | (4,069) | ​ |  | 888.78
Canceled or forfeited |  | (20) | ​ |  | 962.49
Nonvested at November 21, 2020 |  | 16,399 | ​ | $ | 1,004.49
​ Total share-based compensation expense (a component of Operating, selling, general and administrative expenses) was $10.5 million for the twelve week period ended November 21, 2020, and $10.0 million for the comparable prior year period. For the twelve week period ended November 21, 2020, 293,280 stock options were excluded from the diluted earnings per share computation because they would have been anti-dilutive. For the comparable prior year period, 107,511 anti-dilutive shares were excluded from the dilutive earnings per share computation. See AutoZone’s Annual Report on Form 10-K for the year ended August 29, 2020, for a discussion regarding the methodology used in developing AutoZone’s assumptions to determine the fair value of the option awards and a description of AutoZone’s Amended and Restated 2011 Equity Incentive Award Plan and the 2020 Director Compensation Program.

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