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Pension Plans (Fair Value Of Plan Assets) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | $ 69,879 | $ 70,141
Government [Member] |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 26,996 | 29,754
Europe Corporate Investment Grade [Member] |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 4,816 | 2,499
Europe Large Capitalization Stocks [Member] |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 22,648 | 24,502
Commodity Option [Member] |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 1,086 | 724
Insurance Company Funds [Member] |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 8,494 | 8,413
Cash [Member] |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 5,839 | 4,249
Level 1 |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 61,385 | 61,728
Level 1 | Government [Member] |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 26,996 | 29,754
Level 1 | Europe Corporate Investment Grade [Member] |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 4,816 | 2,499
Level 1 | Europe Large Capitalization Stocks [Member] |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 22,648 | 24,502
Level 1 | Commodity Option [Member] |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 1,086 | 724
Level 1 | Insurance Company Funds [Member] |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 1 | Cash [Member] |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 5,839 | 4,249
Level 2 |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 8,494 | 8,413
Level 2 | Government [Member] |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 2 | Europe Corporate Investment Grade [Member] |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 2 | Europe Large Capitalization Stocks [Member] |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 2 | Commodity Option [Member] |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 2 | Insurance Company Funds [Member] |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 8,494 | 8,413
Level 2 | Cash [Member] |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 3 |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 3 | Government [Member] |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 3 | Europe Corporate Investment Grade [Member] |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 3 | Europe Large Capitalization Stocks [Member] |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 3 | Commodity Option [Member] |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 3 | Insurance Company Funds [Member] |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 3 | Cash [Member] |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | $ 0 | $ 0

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