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Dividends and Share Repurchases (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | ---
Apr. 27, 2021 | Apr. 02, 2021 | Feb. 19, 2021 | Jan. 26, 2021 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Cash dividends per share (in dollars per share) |  |  | $ 0.23 |  | $ 0.23 | $ 0.22 | $ 0.45 | $ 0.43
Stock repurchased (in shares) |  |  |  |  | 2,824,588 |  |  |
Average cost per share (in dollars per share) |  |  |  |  | $ 31.53 |  |  |
Total cost |  |  |  |  | $ 89,071 | $ 78,610 | $ 89,772 | $ 112,089
Remaining shares authorized to be repurchased (in shares) |  |  |  |  | 11,769,687 |  | 11,769,687 |
Additional shares authorized for repurchase (in shares) |  |  |  | 10,000,000 |  |  |  |
Dutch Auction |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Stock repurchased (in shares) |  |  |  |  | 1,715,335 |  |  |
Total cost |  |  |  |  | $ 53,780 |  |  |
Subsequent Event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Common stock dividends declared (in dollars per share) | $ 0.23 |  |  |  |  |  |  |
Preferred stock dividends declared (in dollars per share) |  | $ 9.0729 |  |  |  |  |  |
Depository dividends declared (in dollars per share) |  | $ 0.22682250 |  |  |  |  |  |

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