Credit Facilities, Short-term Borrowings and Long-term Debt (Narrative) (Details)			9 Months Ended	12 Months Ended
	May 30, 2025 USD ($)	Nov. 15, 2023 USD ($)	Jun. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 1,025,696,000
Outstanding borrowings			353,000,000
Borrowings outstanding			353,000,000	$ 217,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			1,000,000,000
Line of credit facility, maximum borrowing capacity extension			1,500,000,000
Outstanding borrowings			353,000,000
Principal amount borrowing outstanding			$ 353,000,000	$ 217,000,000
Effective interest rate			0.0543	0.0582
Foreign Lines of Credit and Overdraft Facilities [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 25,600,000
Borrowings outstanding			$ 0	$ 0
Minimum [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]			Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Basis spread on variable rate			0.875%
Maximum [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]			Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Basis spread on variable rate			1.75%
Series H and K Notes [Member]
Debt Instrument [Line Items]
Payment of principal balance		$ 75,000,000
Series P Notes [Member]
Debt Instrument [Line Items]
Payment of principal balance	$ 85,000,000