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Acquisitions - National Cooperative Refinery Association Acquisition (Details) (USD $)
 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended 3 Months Ended 37 Months Ended 46 Months Ended 3 Months Ended
Aug. 31, 2012
Aug. 31, 2014
Aug. 31, 2013
Nov. 29, 2011
National Cooperative Refinery Association
Aug. 31, 2014
National Cooperative Refinery Association
Aug. 31, 2013
National Cooperative Refinery Association
Nov. 29, 2011
National Cooperative Refinery Association
Parent
Aug. 31, 2014
National Cooperative Refinery Association
Accrued liability for contingent crack spread payments related to purchase of noncontroling interests
Aug. 31, 2013
National Cooperative Refinery Association
Accrued liability for contingent crack spread payments related to purchase of noncontroling interests
Nov. 29, 2011
National Cooperative Refinery Association
Accrued liability for contingent crack spread payments related to purchase of noncontroling interests
Aug. 31, 2014
National Cooperative Refinery Association
Interest, Net
Aug. 31, 2013
National Cooperative Refinery Association
Interest, Net
Nov. 29, 2011
National Cooperative Refinery Association
Growmark
contingent_payments
Closings
Nov. 29, 2011
National Cooperative Refinery Association
MFA
contingent_payments
Closings
Nov. 30, 2013
Crack Spread Contingent Payment [Member]
Sep. 30, 2014
Subsequent Event [Member]
National Cooperative Refinery Association
Sep. 30, 2015
Subsequent Event [Member]
National Cooperative Refinery Association
Growmark
Sep. 30, 2015
Subsequent Event [Member]
National Cooperative Refinery Association
MFA
Nov. 30, 2014
Subsequent Event [Member]
Crack Spread Contingent Payment [Member]
Business Acquisition [Line Items]                                      
Percentage of voting interest acquired       25.571%                 18.616% 6.955%          
Percentage of voting interest, owned before transaction       74.429% 84.00%                     88.90%      
Number of separate closings                         4 4          
Aggregate base purchase price                                 $ 255,500,000 $ 95,500,000  
Business Combination, Step Acquisition, Future Payments Due, First Three Closings                         48,000,000 18,000,000          
Aggregate base purchase price, amount paid at the second closing                         48,000,000 18,000,000          
Aggregate base purchase price, amount paid at the third closing                         48,000,000 18,000,000          
Aggregate base purchase price, amount paid at the final closing                         111,400,000 41,600,000          
Number of purchase price payments                         2 2          
Current portion of mandatorily redeemable noncontrolling interest   65,981,000 65,981,000   214,700,000 275,400,000                          
Shares Subject To Mandatory Redemption, Interest Accretion         5,300,000 6,700,000                          
Purchase of noncontrolling interests 433,864,000     337,100,000     96,700,000                        
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest               114,900,000 150,600,000 105,200,000                  
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability               (19,200,000) 23,100,000                    
Business Acquisition, Contingent Consideration, Potential Cash Payment                             16,500,000       0
Patronage earned by member                     $ 65,500,000 $ 142,400,000