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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, 2021
Dec. 31, 2020
Earnings Per Share And Common Stock [Abstract]    
Net income $ 46,089 $ 23,515
Weighted-average shares outstanding—Basic 117,347 116,401
Dilutive effect of restricted stock units 1,251 1,204
Weighted-average shares outstanding—Diluted 118,598 117,605
Earnings per share—Basic $ 0.39 $ 0.20
Earnings per share—Diluted $ 0.39 $ 0.20