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Notes Payable and Long-Term Debt - Footnote Narrative (Details) - USD ($)
$ in Thousands
6 Months Ended
Feb. 28, 2018
Aug. 31, 2017
Debt Instrument [Line Items]    
Notes payable $ 2,993,456 $ 1,988,215
Notes payable    
Debt Instrument [Line Items]    
Notes payable 2,844,803 1,695,423
CHS Capital notes payable    
Debt Instrument [Line Items]    
Notes payable 148,653 292,792
Five-Year Revolving Facilities [Member] | Line of Credit [Member] | Revolving credit facility    
Debt Instrument [Line Items]    
Line of Credit Facility, Current Borrowing Capacity $ 3,000,000  
Debt Instrument, Term 5 years  
Long-term Line of Credit, Amount Outstanding $ 1,700,000 $ 480,000