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Investments - Narrative (Details)
12 Months Ended
Feb. 01, 2016
USD ($)
Aug. 31, 2014
USD ($)
Feb. 01, 2096
USD ($)
Aug. 31, 2016
USD ($)
T
Aug. 31, 2015
USD ($)
May 31, 2014
CF Nitrogen LLC [Member]            
Schedule of Equity Method Investments [Line Items]            
Payments to Acquire Equity Method Investments $ 2,800,000,000          
Supply agreement, term 80 years          
Maximum annual granular urea eligible for purchases | T       1,100,000    
Maximum annual UAN eligible for purchases | T       580,000    
Equity Method Investments       $ 2,796,323,000 $ 0  
TEMCO, LLC [Member]            
Schedule of Equity Method Investments [Line Items]            
Equity Method Investment, Ownership Percentage       50.00%    
Equity Method Investments       $ 44,578,000 57,656,000  
TEMCO, LLC [Member] | Ag [Member]            
Schedule of Equity Method Investments [Line Items]            
Equity Method Investment, Ownership Percentage       50.00%    
Horizon Milling, LLC [Member]            
Schedule of Equity Method Investments [Line Items]            
Equity Method Investment, Ownership Percentage           24.00%
Equity Method Investment, Realized Gain (Loss) on Disposal   $ 109,200,000        
Ventura Foods, LLC            
Schedule of Equity Method Investments [Line Items]            
Equity value exceeding carrying value       $ 12,900,000    
Equity Method Investments       $ 369,487,000 $ 347,749,000  
Ventura Foods, LLC | Ag [Member]            
Schedule of Equity Method Investments [Line Items]            
Equity Method Investment, Ownership Percentage       50.00%    
Scenario, Forecast [Member] | CF Nitrogen LLC [Member]            
Schedule of Equity Method Investments [Line Items]            
Equity Method Investments     $ 0