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Per Share Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Earnings Per Share [Abstract]        
Undistributed Earnings (Loss) Available to Common Shareholders, Basic $ 76,670 $ 54,767 $ 202,567 $ 139,909
Noncontrolling Interest, Change in Redemption Value $ (560)   (2,142) (21,260)
Noncontrolling Interest, Period Increase (Decrease)     $ (1,618) $ (16,056)
Weighted Average Number of Shares Outstanding, Basic 19,856,289 20,224,102 19,938,694 20,216,981
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 247,968 272,768 249,341 245,875
Weighted Average Number of Shares Outstanding, Diluted 20,104,257 20,496,870 20,188,035 20,462,856
Earnings Per Share, Basic $ 3.86 $ 2.71 $ 10.16 $ 6.92
Earnings Per Share, Diluted $ 3.81 $ 2.67 $ 10.03 $ 6.84
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Net Income (Loss) Available to Common Stockholders, Basic $ 77,230 $ 62,100 $ 204,185 $ 155,965
Stockholders' Equity, Period Increase (Decrease) $ (560) $ (7,333) $ (1,618) $ (16,056)
Phantom Share Units (PSUs) [Member]        
Earnings Per Share [Abstract]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0 187 20,552 796
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0 187 20,552 796