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Financial Instruments - Schedule of Derivative Instruments in Statement of Financial Position, Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Sep. 30, 2023
Derivatives Fair Value [Line Items]    
Net financial instruments, assets $ 357,101 $ 385,664
Net financial instruments, liabilities (5,840) (15,408)
Designated As Hedges:    
Derivatives Fair Value [Line Items]    
Gross financial instruments, assets 355,781 379,101
Gross financial instruments, liabilities 0 0
Designated As Hedges: | Other current assets | Interest rate contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, assets 258,622  
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 97,159 379,101
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 1,320 6,563
Gross financial instruments, liabilities (5,840) (15,408)
Not Designated As Hedges: | Other current assets | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, assets 1,320 4,071
Not Designated As Hedges: | Other current liabilities | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, liabilities $ (5,840) (14,584)
Not Designated As Hedges: | Deferred charges and other assets | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, assets   2,492
Not Designated As Hedges: | Deferred credits and other liabilities | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, liabilities   $ (824)