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Dividends and Share Repurchases (Details) - $ / shares |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Apr. 29, 2019 | Feb. 22, 2019 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Dividends Payable [Line Items] |  |  |  |  |  |
Cash dividends per share (in dollars per share) |  | $ 0.2 | $ 0.2 | $ 0.17 | $ 0.38 | $ 0.32
Stock repurchased (in shares) |  |  | 698,705 |  |  |
Average cost per share (in dollars per share) |  |  | $ 29.65 |  |  |
Remaining shares authorized to be repurchased (in shares) |  |  | 9,593,701 |  | 9,593,701 |
Subsequent Event |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Dividends declared (in dollars per share) | $ 0.2 |  |  |  |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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