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Retirement Benefits (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Percentage of annual contribution equal to eligible prior year wages |  |  | 5.00% |  |
Common shares issued from treasury stock for benefit plans, shares | 124 | 158 |  |  |
Common shares issued from treasury stock for benefit plans | $ 14,748 | $ 14,846 | $ 14,748 | $ 14,846 |
Minimum [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Number of years of service |  |  | 2 years |  |
Treasury Stock at Cost [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Common shares issued from treasury stock for benefit plans, shares | 124 | 158 | 124 | 158 |
Common shares issued from treasury stock for benefit plans | $ 5,328 | $ 5,673 | $ 5,328 | $ 5,673 |
Defined Benefit Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
UK High Court Ruling Amendment |  |  |  |  | $ 601

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