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Retirement Benefits (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Common shares issued from treasury stock for benefit plans | $ 14,846 | $ 14,741 | $ 14,846 | $ 14,741
Preferred Stock [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Common shares issued from treasury stock for benefit plans |  |  |  |
Treasury Stock at Cost [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Common shares issued from treasury stock for benefit plans | $ 5,673 | $ 7,584 | $ 5,673 | $ 7,584
Common shares issued from treasury stock for benefit plans, shares | 158 | 202 | 158 | 202

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