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Quarterly Information - Schedule of Quarterly Financial Information (Details) - USD ($)
$ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 275,063 $ 288,168 $ 255,108 $ 194,017 $ 208,641 $ 192,365 $ 171,444 $ 126,858 $ 1,012,356 $ 699,308  
Gross profit 80,434 81,740 62,720 48,194 51,982 42,670 33,437 19,464 273,088 147,553 $ 85,018
Net income $ 46,052 $ 46,223 $ 33,488 $ 24,085 $ 26,436 $ 18,454 $ 8,473 $ 1,162 $ 149,848 $ 54,525 $ 13,737
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
Change in contract estimates due to project cancellations $ 2,200       $ 1,000 $ 1,700 $ 1,600   $ 2,200 $ 4,300  
Decrease in valuation allowance         $ (1,900)       $ (400)