v3.26.1
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 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Earnings Per Share And Common Stock [Abstract]        
Net Income (Loss) $ 118,780 $ 141,328 $ 876,021 $ 386,204
Weighted-average shares outstanding—Basic 114,677 119,913 117,401 120,106
Dilutive effect of restricted stock units 301 548 443 709
Weighted-average shares outstanding—Diluted 114,978 120,461 117,844 120,815
Earnings per share—Basic $ 1.04 $ 1.18 $ 7.46 $ 3.22
Earnings per share—Diluted $ 1.03 $ 1.17 $ 7.43 $ 3.2