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Derivative Financial Instruments and Hedging Activities - Derivatives (Details)
$ in Thousands, bbl in Millions
 6 Months Ended 12 Months Ended
Feb. 28, 2019
USD ($)
bbl
Aug. 31, 2018
USD ($)
bbl
Derivative [Line Items]    
Derivative Asset, Noncurrent $ 25,400 $ 23,100
Derivative Liability, Noncurrent 3,200 7,900
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 231,355 316,545
Derivative Assets 262,504 352,029
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet 31,149 35,484
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 180,015 397,288
Derivative Liabilities 216,610 445,755
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 5,446 12,983
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet $ 31,149 35,484
Credit Rating Agencies Threshold, Minimum 66.67%  
CF Nitrogen LLC [Member]    
Derivative [Line Items]    
Annual Payment Receivable Contingent On Investment Credit Rating $ 5,000  
Embedded derivative asset 20,600  
Foreign currency derivatives | Not Designated as Hedging Instrument    
Derivative [Line Items]    
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 15,022 6,698
Derivative Assets 18,814 15,401
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet 3,792 8,703
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 790 15,998
Derivative Liabilities 4,582 24,701
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 0 0
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet 3,792 8,703
Derivative Asset, Notional Amount 839,500 988,800
Interest rate swap derivatives | Designated as Hedging Instrument    
Derivative [Line Items]    
Derivative Assets 377  
Derivative Liabilities 4,733 9,452
Embedded Derivative Financial Instruments [Member] | Not Designated as Hedging Instrument    
Derivative [Line Items]    
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 20,557 23,595
Derivative Assets 20,557 23,595
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet 0 0
Commodity derivatives | Not Designated as Hedging Instrument    
Derivative [Line Items]    
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 195,776 286,252
Derivative Assets 223,133 313,033
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet 27,357 26,781
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 179,225 381,290
Derivative Liabilities 212,028 421,054
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 5,446 12,983
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet 27,357 $ 26,781
Fair Value Hedging | Interest rate swap derivatives | Designated as Hedging Instrument    
Derivative [Line Items]    
Derivative Asset, Notional Amount $ 495,000  
Cash Flow Hedging    
Derivative [Line Items]    
Aggregate notional amount of cash flow hedges (in barrels) | bbl 5.9 1.1
Cash Flow Hedging | Designated as Hedging Instrument    
Derivative [Line Items]    
Derivative Assets $ 13,822 $ 812
Derivative Liabilities $ 1,937 $ 634