CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDER'S EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Statement of Stockholders' Equity [Abstract]
Dividends (in dollars per share)	$ 1.82	$ 1.74	$ 1.66
Accounting Standards Update [Extensible List]		Accounting Standards Update 2018-02 [Member]