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Fair Value Measurements (Tables)
 12 Months Ended
Aug. 31, 2021
Fair Value Disclosures [Abstract]  
Schedule of assets and liabilities recognized at fair value on a recurring basis The following tables present assets and liabilities, included on our Consolidated Balance Sheets, that are recognized at fair value on a recurring basis and indicate the fair value hierarchy utilized to determine these fair values. Assets and liabilities are classified in their entirety based on the lowest level of input that is a significant component of the fair value measurement. The lowest level of input is considered Level 3. Our assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the classification of fair value assets and liabilities within the fair value hierarchy levels.
    Recurring fair value measurements at August 31, 2021 and 2020, are as follows:
2021
Quoted Prices in Active Markets
for Identical Assets
(Level 1)		Significant Other Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Total
 (Dollars in thousands)
Assets    
Commodity derivatives$2,453 $542,253 $— $544,706 
Foreign currency derivatives— 19,429 — 19,429 
Deferred compensation assets51,940 — — 51,940 
Embedded derivative asset— 16,488 — 16,488 
Segregated investments and marketable securities99,837 — — 99,837 
Other assets6,052 — — 6,052 
Total$160,282 $578,170 $— $738,452 
Liabilities    
Commodity derivatives$1,615 $444,247 $— $445,862 
Foreign currency derivatives— 8,506 — 8,506 
Total$1,615 $452,753 $— $454,368 
 2020
Quoted Prices in Active Markets
for Identical Assets
(Level 1)		Significant Other Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Total
 (Dollars in thousands)
Assets    
Commodity derivatives$5,762 $355,783 $— $361,545 
Foreign currency derivatives— 11,523 — 11,523 
Deferred compensation assets47,669 — — 47,669 
Embedded derivative asset— 18,998 — 18,998 
Segregated investments and marketable securities85,950 — — 85,950 
Other assets5,276 — — 5,276 
Total$144,657 $386,304 $— $530,961 
Liabilities    
Commodity derivatives$6,037 $346,126 $— $352,163 
Foreign currency derivatives— 69,467 — 69,467 
Total$6,037 $415,593 $— $421,630