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v3.26.1

Credit Facilities, Short-term Borrowings and Long-term Debt (Narrative) (Details) |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 17, 2025 USD ($) | Mar. 31, 2026 USD ($) | Sep. 30, 2025 USD ($)
Debt Instrument [Line Items] |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 1,025,633,000 |
Outstanding borrowings |  | 623,000,000 |
Borrowings outstanding |  | 623,000,000 | $ 122,300,000
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 |
Maturity date |  | Oct. 21, 2027 |
Outstanding borrowings |  | $ 623,000,000 |
Principal amount borrowing outstanding |  | $ 623,000,000 | $ 122,300,000
Effective interest rate |  | 0.0478 | 0.0541
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] |  |  |
Basis spread on variable rate |  | 0.875% |
Maximum [Member] | Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 1.75% |
Series I and L Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Payment of principal balance | $ 75,000,000 |  |

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