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Dividends and Share Repurchases (Details) - $ / shares |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jul. 22, 2019 | May 24, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Dividends Payable [Line Items] |  |  |  |  |  |
Cash dividends per share (in dollars per share) |  | $ 0.20 | $ 0.20 | $ 0.17 | $ 0.58 | $ 0.49
Stock repurchased (in shares) |  |  | 1,056,460 |  |  |
Average cost per share (in dollars per share) |  |  | $ 32.45 |  |  |
Remaining shares authorized to be repurchased (in shares) |  |  | 8,537,241 |  | 8,537,241 |
Subsequent Event |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Dividends declared (in dollars per share) | $ 0.21 |  |  |  |  |

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