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STOCK-BASED COMPENSATION PLANS | 9 Months Ended
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May. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-based compensation plans | NOTE 11. STOCK-BASED COMPENSATION PLANS The Company's stock-based compensation plans are described, and informational disclosures provided, in Note 15, Stock-Based Compensation Plans, to the consolidated financial statements in the Company's Annual Report on Form 10-K for the fiscal year ended August 31, 2014. During the nine months ended May 31, 2015 and 2014, restricted stock units and performance stock units totaling 1.1 million and 1.2 million, respectively, were granted at a weighted-average fair value of $15.92 and $16.90, respectively. During the nine months ended May 31, 2015 and 2014, the Company granted 392,517 and 390,562 equivalent shares, respectively, of performance stock units and restricted stock units accounted for as liability awards. The fair value of these liability awards is remeasured each reporting period and is recognized ratably over the service period. As of May 31, 2015, the Company had 913,712 equivalent shares in liability awards outstanding. The Company expects 868,025 equivalent shares to vest. In general, the restricted stock units granted during fiscal 2015 and 2014 vest ratably over a period of three years; however, certain restricted stock units granted during fiscal 2015 either vest after a period of three years or vest after a specified service period; one-third of each such award vest on the second anniversary of the grant date and the remaining two-thirds of each such award vest on the third anniversary of the grant date. In addition, certain restricted stock units granted during fiscal 2014 vest after a specified service period; 25% of the award vest on the second anniversary of the grant date; 25% of each such award vest on the third anniversary of the grant date and the remaining 50% of each such award vest on the fourth anniversary of the grant date. Subject to the achievement of performance targets established by the Compensation Committee of CMC's Board of Directors, the performance stock units granted during fiscal 2015 and fiscal 2014 will vest after a period of three years. Stock-based compensation expense for the three and nine months ended May 31, 2015 of $6.5 million and $18.3 million, respectively, and $5.3 million and $16.1 million for the three and nine months ended May 31, 2014, respectively, was included in selling, general and administrative expenses on the Company's consolidated statements of earnings.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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