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Financial Instruments - Schedule of Derivative Instruments in Statement of Financial Position, Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Sep. 30, 2023
Derivatives Fair Value [Line Items]    
Net financial instruments, assets $ 320,867 $ 385,664
Net financial instruments, liabilities (21,596) (15,408)
Designated As Hedges:    
Derivatives Fair Value [Line Items]    
Gross financial instruments, assets 317,561 379,101
Gross financial instruments, liabilities 0 0
Designated As Hedges: | Other current assets | Interest rate contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, assets 232,975  
Designated As Hedges: | Other current liabilities | Interest rate contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, liabilities 0  
Designated As Hedges: | Deferred charges and other assets | Interest rate contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, assets 84,586 379,101
Designated As Hedges: | Deferred credits and other liabilities | Interest rate contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, liabilities 0 0
Not Designated As Hedges:    
Derivatives Fair Value [Line Items]    
Gross financial instruments, assets 3,306 6,563
Gross financial instruments, liabilities (21,596) (15,408)
Not Designated As Hedges: | Other current assets | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, assets 2,545 4,071
Not Designated As Hedges: | Other current liabilities | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, liabilities (19,819) (14,584)
Not Designated As Hedges: | Deferred charges and other assets | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, assets 761 2,492
Not Designated As Hedges: | Deferred credits and other liabilities | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, liabilities $ (1,777) $ (824)