Consolidate Statement of Shareholders' Equity (Parenthetical) - $ / shares	1 Months Ended							12 Months Ended
	Oct. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Nov. 30, 2017	Sep. 30, 2017	Jul. 31, 2017	Mar. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Statement of Stockholders' Equity [Abstract]
Cash dividends declared per share (in dollars per share)	$ 0.275	$ 0.275	$ 0.275	$ 0.275	$ 0.275	$ 0.275	$ 0.275	$ 0.275	$ 0.825	$ 0.825