Earnings per Share (EPS) and Common Stock - Earnings Per Share Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Earnings Per Share And Common Stock [Abstract]
Net Income (Loss)	$ 166,518	$ 82,232
Weighted-average shares outstanding—Basic	119,330	120,243
Dilutive effect of restricted stock units	659	902
Weighted-average shares outstanding—Diluted	119,989	121,145
Earnings per share—Basic	$ 1.4	$ 0.68
Earnings per share—Diluted	$ 1.39	$ 0.68