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Financial Instruments - Schedule of Financial Instruments on the Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024
Derivatives, Fair Value [Line Items]
Gross/net financial instruments, assets	$ 9,897	$ 96,288
Gross/net financial instruments, liabilities	(6,485)	(7,637)
Designated As Hedges:
Derivatives, Fair Value [Line Items]
Gross/net financial instruments, assets		91,981
Gross/net financial instruments, liabilities		0
Designated As Hedges: | Deferred charges and other assets | Interest rate contracts
Derivatives, Fair Value [Line Items]
Gross/net financial instruments, assets		91,981
Designated As Hedges: | Deferred credits and other liabilities | Interest rate contracts
Derivatives, Fair Value [Line Items]
Gross/net financial instruments, liabilities		0
Not Designated As Hedges:
Derivatives, Fair Value [Line Items]
Gross/net financial instruments, assets	9,897	4,307
Gross/net financial instruments, liabilities	(6,485)	(7,637)
Not Designated As Hedges: | Other current assets | Commodity contracts
Derivatives, Fair Value [Line Items]
Gross/net financial instruments, assets	5,303	2,091
Not Designated As Hedges: | Other current liabilities | Commodity contracts
Derivatives, Fair Value [Line Items]
Gross/net financial instruments, liabilities	(6,339)	(7,324)
Not Designated As Hedges: | Deferred charges and other assets | Commodity contracts
Derivatives, Fair Value [Line Items]
Gross/net financial instruments, assets	4,594	2,216
Not Designated As Hedges: | Deferred credits and other liabilities | Commodity contracts
Derivatives, Fair Value [Line Items]
Gross/net financial instruments, liabilities	$ (146)	$ (313)

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