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Receivables - Narrative (Details) (USD $)
 12 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Notes Receivable, Long-Term    
CHS Capital long-term notes receivable $ 159,700,000 $ 127,700,000
Percentage of commercial notes to CHS Capital long-term notes receivable 46.00% 59.00%
Percentage of producer notes to CHS Capital long-term notes receivable 54.00% 41.00%
Interest income accrual, discontinue, term 90 days  
Minimum
    
Notes Receivable, Short-Term    
CHS Capital short-term notes receivable, term 12 months  
Maximum
    
Notes Receivable, Short-Term    
CHS Capital short-term notes receivable, term 14 months  
Notes and Loans Receivable, Net, Noncurrent, Term 10 years  
CHS Capital [Member]
    
Notes Receivable, Long-Term    
CHS Capital long-term notes receivable additional available credit of counterparty $ 1,100,000,000