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Shareholders' Equity - Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Weighted average shares outstanding (in shares) 72,529,188 76,721,969 80,471,316
Weighted average diluted shares (in shares) 72,565,920 76,731,464 80,495,163
Net income available to common shareholders, basic $ 173,581 $ 173,438 $ 210,256
Net income available to common shareholders, diluted $ 173,581 $ 173,438 $ 210,256
Basic EPS (in dollars per share) $ 2.39 $ 2.26 $ 2.61
Diluted EPS (in dollars per share) $ 2.39 $ 2.26 $ 2.61
Warrants      
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Weighted average dilutive warrants and options (in shares) 0 0 4,448
Options      
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Weighted average dilutive warrants and options (in shares) 36,732 9,495 19,399