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Retirement Benefits (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2026 | Mar. 31, 2025
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Percentage of annual contribution equal to eligible prior year wages |  |  | 5.00% |
Common shares issued from treasury to settle benefit obligations | $ 29,813 | $ 24,058 | $ 29,813 | $ 24,912
Treasury Stock [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Common shares issued for benefit plans, shares | 78,000 | 126,000 | 78,000 | 131,000
Common shares issued from treasury to settle benefit obligations | $ 3,525 | $ 6,295 | $ 3,525 | $ 6,534

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