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EARNINGS PER SHARE (Calculations of Basic and Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Aug. 31, 2025
Aug. 31, 2024
Aug. 31, 2023
Earnings Per Share [Abstract]      
Net earnings $ 84,662 $ 485,491 $ 859,760
Earnings Per Share, Basic [Abstract]      
Average basic shares outstanding (in shares) 112,994,381 115,844,977 117,077,703
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]      
Effect of dilutive securities (in shares) 1,092,369 1,307,575 1,528,568
Average diluted shares outstanding (in shares) 114,086,750 117,152,552 118,606,271
Diluted earnings per share from continuing operations attributable to CMC (USD per share) $ 0.74 $ 4.14 $ 7.25