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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Numerator:                      
Net income $ 46,052 $ 46,223 $ 33,488 $ 24,085 $ 26,436 $ 18,454 $ 8,473 $ 1,162 $ 149,848 $ 54,525 $ 13,737
Denominator:                      
Weighted average basic shares (in shares)                 11,982 11,879 11,797
Dilutive effect of restricted stock and restricted stock units (in shares)                 206 241 146
Weighted average diluted shares (in shares)                 12,188 12,120 11,943
Earnings per share:                      
Basic (in dollars per share) $ 3.84 $ 3.85 $ 2.79 $ 2.02 $ 2.22 $ 1.55 $ 0.71 $ 0.10 $ 12.51 $ 4.59 $ 1.16
Diluted (in dollars per share) $ 3.77 $ 3.79 $ 2.75 $ 1.98 $ 2.17 $ 1.52 $ 0.70 $ 0.10 $ 12.29 $ 4.50 $ 1.15