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Comprehensive Income - Components of Comprehensive Income, Net of Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Aug. 31, 2013
Aug. 31, 2012
Aug. 31, 2011
Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Net income $ 996,328 $ 1,335,719 $ 1,061,028
Pension and other postretirement, net of tax expense (benefit) of $(21,710), $17,776 and $(30,847) in 2012, 2011, and 2010, respectively (63,116) 38,216 (28,001)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax 979 355 716
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax (3,866) (5,855) 4,464
Other Comprehensive Income (Loss), Net of Tax 75,720 (43,130) 32,176
Total comprehensive income 1,072,048 1,292,589 1,093,204
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest 3,942 75,091 101,458
Comprehensive income attributable to CHS Inc. 1,068,106 1,217,498 991,746
Other Comprehensive Income (Loss), Tax [Abstract]      
Pension and other postretirement, tax $ 21,710 $ (17,776) $ 30,847