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Condensed Consolidated Statements Of Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019
Statement of Stockholders' Equity [Abstract] |  |  |  |  |  |
Tax effect included in net pension and postretirement benefit gains | $ 28 | $ 28 | $ 29 | $ 21 | $ 22 | $ 21
Common stock, dividends per share (in dollars per share) | $ 0.75 | $ 0.75 | $ 0.70 | $ 0.70 | $ 0.70 | $ 0.65

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