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Fair Value Measurements (Tables)
12 Months Ended
Aug. 31, 2023
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 as of August 31, 2023 and 2022, are as follows:
2023
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$5,344 $283,491 $— $288,835 
Foreign currency derivatives— 32,402 — 32,402 
Segregated investments and marketable securities225,715 — — 225,715 
Other assets89,592 — — 89,592 
Total$320,651 $315,893 $— $636,544 
Liabilities    
Commodity derivatives$7,501 $346,975 $— $354,476 
Foreign currency derivatives— 13,799 — 13,799 
Total$7,501 $360,774 $— $368,275 
 2022
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$1,161 $490,160 $— $491,321 
Foreign currency derivatives— 52,923 — 52,923 
Segregated investments and marketable securities238,124 — — 238,124 
Other assets58,280 — — 58,280 
Total$297,565 $543,083 $— $840,648 
Liabilities    
Commodity derivatives$10,256 $379,883 $— $390,139 
Foreign currency derivatives— 12,649 — 12,649 
Total$10,256 $392,532 $— $402,788