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Quarterly Financial Data (Unaudited) (Details) (USD $)
In Thousands, except Per Share data
3 Months Ended12 Months Ended
Aug. 31, 2011
May 31, 2011
Feb. 28, 2011
Nov. 30, 2010
Aug. 31, 2010
May 31, 2010
Feb. 28, 2010
Nov. 30, 2009
Aug. 31, 2009
May 31, 2009
Feb. 28, 2009
Nov. 30, 2008
Aug. 31, 2011
Aug. 31, 2010
Aug. 31, 2009
Summarized Quarterly Financial Data               
Net sales$ 2,267,620$ 2,076,564$ 1,791,766$ 1,782,480$ 1,816,247$ 1,765,154$ 1,322,443$ 1,402,258$ 1,411,449$ 1,258,237$ 1,507,460$ 2,232,230$ 7,918,430$ 6,306,102$ 6,409,376
Gross profit171,002215,43981,186148,988158,756119,9048,614107,763148,248179,383134,090235,308   
Net earnings (loss) attributable to CMC$ (120,271)$ 36,165$ (46,162)$ 651$ 8,001$ (8,826)$ (173,290)$ (31,229)$ 7,180$ (13,077)$ (35,307)$ 62,006$ (129,617)$ (205,344)$ 20,802
Basic EPS (loss) attributable to CMC$ (1.04)$ 0.31$ (0.40)$ 0.01$ 0.07$ (0.08)$ (1.53)$ (0.28)$ 0.06$ (0.12)$ (0.32)$ 0.55$ (1.13)$ (1.81)$ 0.19
Diluted EPS (loss) attributable to CMC$ (1.04)$ 0.31$ (0.40)$ 0.01$ 0.07$ (0.08)$ (1.53)$ (0.28)$ 0.06$ (0.12)$ (0.32)$ 0.54$ (1.13)$ (1.81)$ 0.18