Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Basic Earnings Per Share
Net income	$ 351,858	$ 311,292
Less: Income allocated to participating securities	159	186
Income available to common shareholders	$ 351,699	$ 311,106
Basic weighted average shares outstanding (in shares)	156,301	149,796
Net income per share - Basic (USD per share)	$ 2.25	$ 2.08
Diluted Earnings Per Share
Income available to common shareholders	$ 351,699	$ 311,106
Effect of dilutive shares	0	0
Income available to common shareholders	$ 351,699	$ 311,106
Basic weighted average shares outstanding (in shares)	156,301	149,796
Dilutive shares (in shares)	1,523	0
Diluted weighted average shares outstanding (in shares)	157,824	149,796
Net income per share - Diluted (USD per share)	$ 2.23	$ 2.08