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Notes Payable and Long-Term Debt - Footnote Narrative (Details)
6 Months Ended
Feb. 29, 2016
USD ($)
bank
Jan. 31, 2016
USD ($)
Aug. 31, 2015
USD ($)
Debt Instrument [Line Items]      
Notes payable $ 2,797,758,000   $ 1,165,378,000
CHS Capital notes payable      
Debt Instrument [Line Items]      
Notes payable 594,910,000   351,661,000
Notes payable      
Debt Instrument [Line Items]      
Notes payable 2,202,848,000   813,717,000
Five-Year Revolving Facilities [Member] | Line of Credit [Member] | Revolving credit facility      
Debt Instrument [Line Items]      
Line of Credit Facility, Current Borrowing Capacity 3,000,000,000    
Long-term Line of Credit $ 600,000,000   $ 0
Debt Instrument, Term 5 years    
Committed Term Loans, September 2015 [Member] | Secured Debt [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Term 10 years    
Debt Instrument, Face Amount $ 600,000,000    
Long-term Debt 600,000,000.0    
Private Placement Long Term Notes January 2016 [Member] | Unsecured Debt [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount   $ 680,000,000  
Private Placement, payable in its entirety 2023 [Member] | Unsecured Debt [Member]      
Debt Instrument [Line Items]      
Long-term Debt   $ 152,000,000.0  
Debt Instrument, Interest Rate, Stated Percentage   4.39%  
Private Placement, payable in its entirety January 2025 [Member] | Unsecured Debt [Member]      
Debt Instrument [Line Items]      
Long-term Debt   $ 150,000,000.0  
Debt Instrument, Interest Rate, Stated Percentage   4.58%  
Private Placement, payable in its entirety January 2027 [Member] | Unsecured Debt [Member]      
Debt Instrument [Line Items]      
Long-term Debt   $ 58,000,000.0  
Debt Instrument, Interest Rate, Stated Percentage   4.69%  
Private Placement, payable in its entirety January 2028 [Member] | Unsecured Debt [Member]      
Debt Instrument [Line Items]      
Long-term Debt   $ 95,000,000.0  
Debt Instrument, Interest Rate, Stated Percentage   4.74%  
Private Placement, payable in its entirety January 2031 [Member] | Unsecured Debt [Member]      
Debt Instrument [Line Items]      
Long-term Debt   $ 100,000,000.0  
Debt Instrument, Interest Rate, Stated Percentage   4.89%  
Private Placement, payable in its entirety January 2036 [Member] | Unsecured Debt [Member]      
Debt Instrument [Line Items]      
Long-term Debt   $ 125,000,000.0  
Debt Instrument, Interest Rate, Stated Percentage   5.40%  
Bilateral, Uncommitted Revolving Facilities [Member] | Line of Credit [Member] | Revolving credit facility      
Debt Instrument [Line Items]      
Line of Credit Facility, Current Borrowing Capacity $ 1,300,000,000    
Line Of Credit Facility, Number Of Programs | bank 3    
Short-term Debt $ 667,600,000    
Minimum [Member] | Bilateral, Uncommitted Revolving Facilities [Member] | Line of Credit [Member] | Revolving credit facility      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 0.25%    
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Committed Term Loans, September 2015 [Member] | Secured Debt [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 1.50%    
Minimum [Member] | Base Rate [Member] | Committed Term Loans, September 2015 [Member] | Secured Debt [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 0.50%    
Maximum [Member] | Bilateral, Uncommitted Revolving Facilities [Member] | Line of Credit [Member] | Revolving credit facility      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 1.00%    
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Committed Term Loans, September 2015 [Member] | Secured Debt [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 2.00%    
Maximum [Member] | Base Rate [Member] | Committed Term Loans, September 2015 [Member] | Secured Debt [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 1.00%