Consolidated Statements of Shareholders' Equity (Parentheticals) - $ / shares	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Common stock, dividends per share declared (in dollars per share)	$ 2.88	$ 2.74	$ 2.6
Preferred stock dividends per share declared (in dollars per share)	$ 1.475	$ 1.475	$ 1.475