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Shareholders' Equity - Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Weighted average shares outstanding (in shares) 74,244,323 65,192,510 65,287,650
Weighted average diluted shares (in shares) 74,290,568 65,255,283 65,404,110
Net income available to common shareholders, basic $ 185,416 $ 242,801 $ 221,705
Net income available to common shareholders, diluted $ 185,416 $ 242,801 $ 221,705
Basic EPS (in dollars per share) $ 2.50 $ 3.72 $ 3.40
Diluted EPS (in dollars per share) $ 2.50 $ 3.72 $ 3.39
Options      
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Weighted average dilutive options (in shares) 46,245 62,773 116,460