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SHAREHOLDERS' EQUITY - Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Weighted average shares outstanding (in shares) 80,184,395 74,244,323 65,192,510
Weighted average diluted shares (in shares) 80,255,189 74,290,568 65,255,283
Net income available to common shareholders, basic $ 211,443 $ 185,416 $ 242,801
Net income available to common shareholders, diluted $ 211,443 $ 185,416 $ 242,801
Basic EPS (in dollars per share) $ 2.64 $ 2.50 $ 3.72
Diluted EPS (in dollars per share) $ 2.63 $ 2.50 $ 3.72
Options      
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Weighted average dilutive options (in shares) 70,794 46,245 62,773