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Fair Value Measurements - Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Feb. 28, 2019
Aug. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation assets $ 38,703 $ 39,073
Embedded derivative asset 20,557 23,595
Other assets 5,495 5,334
Total assets 320,980 397,249
Foreign currency derivatives   24,701
Total liabilities 223,290 455,842
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation assets 38,703 39,073
Embedded derivative asset 0 0
Other assets 5,495 5,334
Total assets 96,516 98,894
Foreign currency derivatives   0
Total liabilities 22,743 31,778
Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation assets 0 0
Embedded derivative asset 20,557 23,595
Other assets 0 0
Total assets 224,464 298,355
Foreign currency derivatives   24,701
Total liabilities 200,547 424,064
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation assets 0 0
Embedded derivative asset 0 0
Other assets 0 0
Total assets 0 0
Foreign currency derivatives   0
Total liabilities 0 0
Commodity derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 236,955 313,846
Derivative Liability 213,965 421,689
Commodity derivatives | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 52,318 54,487
Derivative Liability 22,743 31,778
Commodity derivatives | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 184,637 259,359
Derivative Liability 191,222 389,911
Commodity derivatives | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 0 0
Derivative Liability 0 0
Foreign currency derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency derivatives 18,893 15,401
Foreign currency derivatives 4,592  
Foreign currency derivatives | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency derivatives 0 0
Foreign currency derivatives 0  
Foreign currency derivatives | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency derivatives 18,893 15,401
Foreign currency derivatives 4,592  
Foreign currency derivatives | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency derivatives 0 0
Foreign currency derivatives 0  
Interest rate swap derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 377  
Derivative Liability 4,733 9,452
Interest rate swap derivatives | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 0  
Derivative Liability 0 0
Interest rate swap derivatives | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 377  
Derivative Liability 4,733 9,452
Interest rate swap derivatives | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 0  
Derivative Liability $ 0 $ 0