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Financial Instruments - Schedule of Derivative Instruments in Statement of Financial Position, Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Sep. 30, 2022
Derivatives Fair Value [Line Items]    
Net financial instruments, assets $ 405,976 $ 381,991
Net financial instruments, liabilities (10,255) (4,129)
Designated As Hedges:    
Derivatives Fair Value [Line Items]    
Gross financial instruments, assets 402,487 355,075
Gross financial instruments, liabilities 0 0
Designated As Hedges: | Other current assets | Interest rate contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, assets 123,716  
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 278,771 355,075
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 3,489 26,916
Gross financial instruments, liabilities (10,255) (4,129)
Not Designated As Hedges: | Other current assets | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, assets 2,811 26,207
Not Designated As Hedges: | Other current liabilities | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, liabilities (9,752) (3,000)
Not Designated As Hedges: | Deferred charges and other assets | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, assets 678 709
Not Designated As Hedges: | Deferred credits and other liabilities | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, liabilities $ (503) $ (1,129)