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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, 2022
USD ($)
bbl
Feb. 28, 2021
USD ($)
Aug. 31, 2021
USD ($)
bbl
Derivative [Line Items]      
Derivative Liability, Noncurrent $ 6,500   $ 4,800
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 867,675   558,993
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet 17,334   9,756
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 554,037   441,126
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 1,219   2,485
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet 17,793   9,756
Embedded Derivative, Gain on Embedded Derivative 1,800 $ 1,900  
Derivative Asset, Noncurrent, Excluding Fair Value Hedges 43,100   21,600
CF Nitrogen LLC [Member]      
Derivative [Line Items]      
Annual Payment Receivable Contingent On Investment Credit Rating 5,000    
Embedded derivative asset 13,300    
Foreign exchange derivatives | Not Designated as Hedging Instrument      
Derivative [Line Items]      
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 61,137   13,847
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet 6,102   5,582
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 129   2,924
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 0   0
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet 6,102   5,582
Derivative, Notional Amount 1,500,000   1,200,000
Embedded Derivative Financial Instruments [Member] | Not Designated as Hedging Instrument      
Derivative [Line Items]      
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 13,287   16,488
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 793,251   528,658
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet 11,232   4,174
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 553,908   438,202
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 1,219   2,485
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet $ 11,691   $ 4,174
Cash Flow Hedging      
Derivative [Line Items]      
Aggregate notional amount of cash flow hedges (in barrels) | bbl 2.4   2.7