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Per Share Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Earnings Per Share [Abstract]        
Undistributed Earnings (Loss) Available to Common Shareholders, Basic $ 46,968 $ 18,780 $ 85,142 $ 42,117
Noncontrolling Interest, Change in Redemption Value (5,941) (2,771) (8,723) (5,826)
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic     0 (10)
Noncontrolling Interest, Period Increase (Decrease) $ (5,941) $ (2,771) $ (8,723) $ (5,826)
Weighted Average Number of Shares Outstanding, Basic 20,227,342 20,170,824 20,213,421 20,206,814
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 252,413 216,972 236,270 207,678
Weighted Average Number of Shares Outstanding, Diluted 20,479,755 20,387,796 20,449,691 20,414,492
Earnings Per Share, Basic $ 2.32 $ 0.93 $ 4.21 $ 2.08
Earnings Per Share, Diluted $ 2.29 $ 0.92 $ 4.16 $ 2.06
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Net Income (Loss) Available to Common Stockholders, Basic $ 52,909 $ 21,551 $ 93,865 $ 47,953
Phantom Share Units (PSUs) [Member]        
Earnings Per Share [Abstract]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 21,584 22,344    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 21,584 22,344