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STOCK-BASED COMPENSATION PLANS | 12 Months Ended
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Aug. 31, 2020
Share-based Payment Arrangement [Abstract] |
STOCK-BASED COMPENSATION PLANS | NOTE 15. STOCK-BASED COMPENSATION PLANS The Company's stock-based compensation plans provide for the issuance of incentive and nonqualified stock options, restricted stock and units and performance-based awards. The Compensation Committee of CMC's Board of Directors (the "Compensation Committee") approves all awards that are granted under the Company's stock-based compensation plans. Stock-based compensation expense for 2020, 2019 and 2018 of $31.9 million, $25.1 million and $23.9 million, respectively, was primarily included in selling, general and administrative expenses on the Company's consolidated statements of earnings. As of August 31, 2020, total unrecognized compensation cost related to unvested stock-based compensation arrangements was $16.7 million, which is expected to be recognized over a weighted average period of three years. The following table summarizes the total awards granted:
|  |  |  | Restricted Stock Awards/Units |  | Performance Awards
2020 grants |  |  |  | 997,454 |  |  | 536,022 |
2019 grants |  |  |  | 889,238 |  |  | 483,984 |
2018 grants |  |  |  | 667,341 |  |  | 367,514 |
As of August 31, 2020, the Company had 5,669,972 shares of common stock available for future grants. Restricted Stock Units Restricted stock units issued under the Company's stock-based compensation plans may not be sold, transferred, pledged or assigned until service-based restrictions lapse. The restricted stock units granted to U.S. employees generally vest and are converted to shares of the Company's common stock in three equal installments on each of the first three anniversaries of the date of grant. The restricted stock units granted to non-U.S. employees in 2020 and 2019 generally vest and are converted to shares of the Company's common stock in three equal installments on each of the first three anniversaries of the date of grant. Restricted stock units granted to non-U.S. employees in 2018 generally vest and are settled in cash in three equal installments on each of the first three anniversaries of the date of grant. Generally, upon termination of employment, restricted stock units that have not vested are forfeited. Upon death, disability or qualifying retirement, a pro-rata portion of the unvested restricted stock awarded will vest and become payable. The estimated fair value of the stock-settled restricted stock units is based on the closing price of the Company's common stock on the date of grant, discounted for the expected dividend yield through the vesting period. Compensation cost related to the stock-settled restricted stock units is recognized ratably over the service period and is included in equity on the Company's consolidated balance sheets. The liability related to the cash-settled restricted stock units was included in accrued expenses and other payables on the Company's consolidated balance sheets. Mark-to-market adjustments recorded to liability-treated awards in 2020, 2019 and 2018 were immaterial. The fair value of the cash-settled restricted stock units is remeasured each reporting period and is recognized ratably over the service period. Performance Stock Units Performance stock units issued under the Company's stock-based compensation plans may not be sold, transferred, pledged or assigned until service-based restrictions lapse and any performance objectives have been attained as established by the Compensation Committee. Recipients of these awards generally must be actively employed by and providing services to the Company on the last day of the performance period in order to receive an award payout. Upon death, disability or qualifying retirement, a pro-rata portion of the performance stock units will vest and become payable at the end of the performance period. Compensation cost for performance stock units is accrued based on the probable outcome of specified performance conditions, net of estimated forfeitures. The Company accrues compensation cost if it is probable that the performance conditions will be met. The Company reassesses the probability of meeting the specified performance conditions at the end of each reporting period and adjusts compensation cost, as necessary, based on the probability of achieving the performance conditions. If the performance conditions are not met at the end of the performance period, the Company reverses the related compensation cost. Performance targets established by the Compensation Committee for performance stock units awarded in 2020, 2019 and 2018 were weighted 75% based on the Company's cumulative EBITDA targets and positive return on invested capital for the fiscal year in which the awards were granted and the succeeding two fiscal years, as approved by CMC's Board of Directors in the respective year's business plan, and 25% based on a three year relative total stockholder return metric. Performance stock units awarded to U.S. participants will be settled in shares of the Company's common stock. Award payouts range from a threshold of 50% to a maximum of 200% for each portion of the target awards. The performance stock units awarded in 2020 and 2019 associated with the cumulative EBITDA targets have been classified as liability awards since the final EBITDA target will not be set until the third year of the performance period. Consequently, these awards were included in accrued expenses and other payables on the Company's consolidated balance sheets. The fair value of these performance stock units is remeasured each reporting period and is recognized ratably over the service period. The performance stock units associated with the total stockholder return metric were valued at fair value on the date of grant using the Monte Carlo pricing model and were included in equity on the Company's consolidated balance sheets. Performance stock units awarded to non-U.S. participants in 2020 and 2019 will be settled in stock while the performance stock units awarded to non-U.S. participants in 2018 will be settled in cash. The fair value of the performance stock units is remeasured each reporting period and is recognized ratably over the service period. The liability related to these awards was included in accrued expenses and other payables on the Company's consolidated balance sheets. Information for restricted stock units and performance stock units, excluding those expected to settle in cash, is as follows:
|  | Number |  | Weighted Average Grant-Date Fair Value
Outstanding as of September 1, 2017 |  | 2,453,580 |  |  | $ | 15.65 |
Granted |  | 1,216,461 |  |  | 20.69 |
Vested |  | (1,685,898) |  |  | 18.00 |
Forfeited |  | (183,425) |  |  | 15.89 |
Outstanding as of August 31, 2018 |  | 1,800,718 |  |  | 16.82 |
Granted |  | 1,505,449 |  |  | 17.75 |
Vested |  | (992,167) |  |  | 20.09 |
Forfeited |  | (34,432) |  |  | 17.90 |
Outstanding as of August 31, 2019 |  | 2,279,568 |  |  | 15.99 |
Granted |  | 1,529,212 |  |  | 18.32 |
Vested |  | (1,417,552) |  |  | 18.80 |
Forfeited |  | (145,591) |  |  | 21.35 |
Outstanding as of August 31, 2020 |  | 2,245,637 |  |  | $ | 18.79 |
The total fair value of shares vested during 2020, 2019 and 2018 was $26.7 million, $19.9 million and $30.3 million, respectively. The Company granted 425,915 and 374,281 equivalent shares of restricted stock units and performance stock units accounted for as liability awards during 2020 and 2019, respectively. As of August 31, 2020, the Company had 773,757 equivalent shares of awards outstanding and expects 735,069 equivalent shares to vest. Stock Purchase Plan Almost all U.S. resident employees may participate in the Company's employee stock purchase plan. Beginning in 2020, each eligible employee may purchase up to 500 shares annually. The Board of Directors established a 15% purchase discount based on market prices on specified dates for 2020, 2019 and 2018. Yearly activity of the stock purchase plan was as follows:
|  | 2020 |  | 2019 |  | 2018
Shares subscribed |  | 347,870 |  |  | 446,950 |  |  | 289,040 |
Price per share |  | $ | 18.80 |  |  | $ | 13.80 |  |  | $ | 17.84 |
Shares purchased |  | 365,990 |  |  | 226,860 |  |  | 123,930 |
Price per share |  | $ | 13.80 |  |  | $ | 17.84 |  |  | $ | 18.99 |
Shares available for future issuance |  | 2,338,304 |  |  |  |  |

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