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Retirement Benefits (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 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 |  |  | $ 14,748 | $ 14,846 |
Defined Benefit Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
UK High Court Ruling Amendment |  |  |  |  | $ 601
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 | 124,000 | 158,000 | 124,000 | 158,000 |
Common shares issued from treasury stock for benefit plans | $ 14,748 | $ 14,846 | $ 5,328 | $ 5,673 |

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