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v3.25.1

Credit Facilities, Short-term Borrowings and Long-term Debt (Narrative) (Details) |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 15, 2023 USD ($) | Mar. 31, 2025 USD ($) | Sep. 30, 2024 USD ($)
Debt Instrument [Line Items] |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 1,025,695,000 |
Outstanding borrowings |  | 261,100,000 |
Borrowings outstanding |  | 261,100,000 | $ 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 |  | 261,100,000 |
Principal amount borrowing outstanding |  | $ 261,100,000 | $ 217,000,000
Effective interest rate |  | 0.0548 | 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 |  |

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