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Investments - Narrative (Details) - Fair Value Hierarchy [Domain] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Nov. 30, 2014
May. 31, 2015
May. 31, 2014
Aug. 31, 2014
Schedule of Equity Method Investments [Line Items]        
Payments for Repurchase of Redeemable Noncontrolling Interest   $ (65,981) $ (65,981)  
Payments to Acquire Other Investments $ 315,000 (170,000) 0  
Time Deposits   170,000    
Increase (Decrease) in Time Deposits   (145,000)    
Ardent Mills [Member]        
Schedule of Equity Method Investments [Line Items]        
Investments redeemed       $ 121,200
Horizon Milling, LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investment, Additional Cash Contribution       32,800
Gain (Loss) on Sale of Investments       $ 109,200
Ardent Mills LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investments   195,200    
Ventura Foods, LLC        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investments   341,500    
Equity value exceeding carrying value   12,900    
TEMCO, LLC        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investments   $ 60,000    
National Cooperative Refinery Association [Member]        
Schedule of Equity Method Investments [Line Items]        
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage   88.90%   84.00%
Payments for Repurchase of Redeemable Noncontrolling Interest   $ (66,000) (66,000)  
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest   $ 109,220    
Cargill, Inc. [Member]        
Schedule of Equity Method Investments [Line Items]        
Ownership of joint venture partner   50.00%    
Crack Spread Contingent Payment [Member]        
Schedule of Equity Method Investments [Line Items]        
Payments to Acquire Business, Contingent Consideration Paid     $ 16,500  
Corporate and Other | Ardent Mills [Member]        
Schedule of Equity Method Investments [Line Items]        
Ownership percentage   12.00%    
Corporate and Other | Ventura Foods, LLC        
Schedule of Equity Method Investments [Line Items]        
Ownership percentage   50.00%    
Ag Business [Member] | TEMCO, LLC        
Schedule of Equity Method Investments [Line Items]        
Ownership percentage   50.00%