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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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Aggregate dividends paid during the period for each share of common stock outstanding.

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