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, 2022	Dec. 31, 2021
Earnings Per Share And Common Stock [Abstract]
Net income	$ 75,035	$ 46,089
Weighted-average shares outstanding—Basic	117,819	117,347
Dilutive effect of restricted stock units	969	1,251
Weighted-average shares outstanding—Diluted	118,788	118,598
Earnings per share—Basic	$ 0.64	$ 0.39
Earnings per share—Diluted	$ 0.63	$ 0.39