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Retirement Benefits (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Number of years of service |  |  | 2 years |
Percentage of annual contribution equal to eligible prior year wages |  |  | 5.00% |
Common shares issued from treasury stock for benefit plans | $ 14,900 | $ 14,748 | $ 14,900 | $ 14,748
Treasury Stock at Cost [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Common shares issued from treasury stock for benefit plans, shares | 128,000 | 124,000 | 128,000 | 124,000
Common shares issued from treasury stock for benefit plans | $ 5,358 | $ 5,328 | $ 5,358 | $ 5,328

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