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Quarterly Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 297,983 $ 286,273 $ 278,631 $ 241,431 $ 275,063 $ 288,168 $ 255,108 $ 194,017 $ 1,104,318 $ 1,012,356  
Gross profit 93,526 87,899 83,432 59,524 80,434 81,740 62,720 48,194 324,381 273,088 $ 147,553
Net income $ 51,420 $ 48,234 $ 46,330 $ 34,763 $ 46,052 $ 46,223 $ 33,488 $ 24,085 $ 180,747 $ 149,848 $ 54,525
Earnings per share:                      
Basic (in dollars per share) $ 4.26 $ 4.00 $ 3.84 $ 2.89 $ 3.84 $ 3.85 $ 2.79 $ 2.02 $ 14.98 $ 12.51 $ 4.59
Diluted (in dollars per share) $ 4.22 $ 3.96 $ 3.81 $ 2.86 $ 3.77 $ 3.79 $ 2.75 $ 1.98 $ 14.86 $ 12.29 $ 4.50
Change in contract estimates due to project cancellations $ 500 $ 2,300 $ 1,800   $ 2,200       $ 4,600 $ 2,200