Dividends and Share Repurchases (Details) - $ / shares				3 Months Ended		9 Months Ended
	Jul. 15, 2024	Jun. 07, 2024	Apr. 15, 2024	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Dividends Payable [Line Items]
Cash dividends per share (in dollars per share)		$ 0.26		$ 0.26	$ 0.25	$ 0.77	$ 0.74
Stock repurchased (in shares)				357,303
Average cost per share (in dollars per share)				$ 26.63
Stock repurchase program, number of additional shares authorized				10,000,000
Remaining shares authorized to be repurchased (in shares)				11,501,005		11,501,005
Preferred stock dividends declared (in dollars per share)			$ 12.1875
Depository dividends declared (in dollars per share)			$ 0.30468750
Subsequent Event
Dividends Payable [Line Items]
Preferred stock dividends declared (in dollars per share)	$ 12.1875
Depository dividends declared (in dollars per share)	$ 0.30468750