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Financial Instruments - Schedule of Financial Instruments on the Balance Sheet (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Sep. 30, 2022
Derivatives, Fair Value [Line Items]    
Net financial instruments, assets $ 385,664 $ 381,991
Net financial instruments, liabilities (15,408) (4,129)
Designated As Hedges:    
Derivatives, Fair Value [Line Items]    
Gross financial instruments, assets 379,101 355,075
Gross financial instruments, liabilities 0 0
Designated As Hedges: | Deferred charges and other assets | Interest rate contracts    
Derivatives, Fair Value [Line Items]    
Gross financial instruments, assets 379,101 355,075
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 6,563 26,916
Gross financial instruments, liabilities (15,408) (4,129)
Not Designated As Hedges: | Other current assets | Commodity contracts    
Derivatives, Fair Value [Line Items]    
Gross financial instruments, assets 4,071 26,207
Not Designated As Hedges: | Other current liabilities | Commodity contracts    
Derivatives, Fair Value [Line Items]    
Gross financial instruments, liabilities (14,584) (3,000)
Not Designated As Hedges: | Deferred charges and other assets | Commodity contracts    
Derivatives, Fair Value [Line Items]    
Gross financial instruments, assets 2,492 709
Not Designated As Hedges: | Deferred credits and other liabilities | Commodity contracts    
Derivatives, Fair Value [Line Items]    
Gross financial instruments, liabilities $ (824) $ (1,129)