Earnings Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Earnings Per Share [Abstract]
Earnings available to stockholders	$ 58,503	$ 66,873	$ 84,084	$ 129,951
Diluted weighted average common shares outstanding (in shares)	170,835,435	170,866,740	170,865,883	170,452,256
Basic weighted average common shares outstanding (in shares)	170,835,435	170,866,740	170,865,883	170,452,256
Basic earnings per common share (in dollars per share)	$ 0.34	$ 0.39	$ 0.49	$ 0.76
Diluted earnings per common share (in dollars per share)	$ 0.34	$ 0.39	$ 0.49	$ 0.76