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Receivables - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Notes Receivable, Long-Term    
CHS Capital long-term notes receivable $ 190.4 $ 159.7
Percentage of commercial notes to CHS Capital long-term notes receivable 34.00% 46.00%
Percentage of producer notes to CHS Capital long-term notes receivable 66.00% 54.00%
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 $ 1,000.0