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Receivables - Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Jul. 31, 2017
USD ($)
Aug. 31, 2017
USD ($)
May 31, 2017
USD ($)
a
Aug. 31, 2017
USD ($)
Aug. 31, 2016
USD ($)
Aug. 31, 2015
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for Doubtful Accounts Receivable, Period Increase (Decrease)     $ 98,700      
Valuation Allowances and Reserves, Additions for Charges to Other Accounts     $ 130,700      
Notes Receivable, Long-Term            
CHS Capital long-term notes receivable   $ 17,000   $ 17,000 $ 322,400  
Percentage of commercial notes to CHS Capital long-term notes receivable   17.00%   17.00% 26.00%  
Percentage of producer notes to CHS Capital long-term notes receivable   83.00%   83.00% 74.00%  
Interest income accrual, discontinue, term       90 days    
Land received as collateral, area | a     14,000      
Debt Extinguished During Sale of Financial Assets $ 554,000     $ 554,000 $ 0 $ 0
Supplemental Deferred Purchase Price $ 580,500          
Maximum            
Notes Receivable, Short-Term            
CHS Capital short-term notes receivable, term       12 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   $ 966,600   $ 966,600    
CHS Capital Notes Receivable [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Note receivables sold under loan participations   71,500        
Notes Receivable, Long-Term            
Loans and Leases Receivable, Allowance   $ 4,200   $ 4,200 $ 45,800  
Customer Concentration Risk [Member] | CHS Capital Notes Receivable [Member]            
Notes Receivable, Long-Term            
Concentration Risk, Percentage         20.00%  
All other third party borrowers [Member] | Customer Concentration Risk [Member] | CHS Capital Notes Receivable [Member]            
Notes Receivable, Long-Term            
Concentration Risk, Percentage       10.00%