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Cash Dividends (Details) - $ / shares |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 07, 2018 | Mar. 01, 2018 | Dec. 05, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Cash Dividends |  |  |  |  |  |  |
Cash dividends declared, per share (in dollars per share) | $ 0.70 |  | $ 0.70 | $ 0.70 | $ 0.70 | $ 1.4 | $ 1.40
Cash dividend paid, per share (in dollars per share) |  | $ 0.70 |  |  |  |  |

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