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STOCKHOLDERS' EQUITY: (Details 2) (USD $)
 1 Months Ended 3 Months Ended 5 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 35 Months Ended
Jul. 31, 2011
Jun. 30, 2011
May 31, 2011
Jun. 30, 2011
Dec. 31, 2008
Oct. 31, 2010
Sep. 30, 2009
Dec. 31, 2008
Jun. 30, 2011
Oct. 14, 2010
Sep. 30, 2010
SCC share repurchase program:                      
Amount authorized for share repurchase program               $ 500,000,000      
Increased amount authorized for share repurchase program 1,000,000,000                    
Total number of Shares Purchased   4,567,520 14,400 4,581,920 28,510,150 15,600 4,912,000   38,019,670    
Average Price Paid per Share (in dollars per share)   $ 32.30 $ 37.06 $ 32.32 $ 13.49 $ 29.69 $ 14.64   $ 15.92    
Total Number of Shares Purchased as Part of Publicly Announced Plan   38,019,670 33,452,150 38,019,670 28,510,150     28,510,150 38,019,670 33,437,750 33,422,150
Maximum Number of Shares that may yet be Purchased Under the Plan @ $32.87   5,929,726   5,929,726         5,929,726    
Share purchase price under the plan (in dollars per share)   $ 32.87   $ 32.87         $ 32.87    
Total cost   $ 147,500,000 $ 500,000 $ 148,000,000 $ 384,700,000 $ 500,000 $ 71,900,000   $ 605,100,000    
Parent Company (Grupo Mexico) common shares
                      
Ownership interest held by parent company                      
Percentage of ownership interest held by parent company (as a percent)   80.40%   80.40%         80.40%