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Pay vs Performance Disclosure - USD ($)
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Pay vs Performance Disclosure          
Pay vs Performance Disclosure, Table
Value of Initial Fixed $100 Investment Based On:
Year
Summary Compensation Table Total for Current PEO(1)
Summary Compensation Table Total for Former PEO(1)
Compensation Actually Paid to Current PEO(1)(2)
Compensation Actually Paid to Former PEO(1)(2)
Average Summary Compensation Table Total for Non-PEO NEOs(1)(2)
Average Compensation Actually Paid to Non-PEO NEOs(1)(2)
Company TSR(3)
Peer Group TSR(3)
Net Income ($000)Revenue ($000)
(a)(b)(b)(c)(c)(d)(e)(f)(g)(h)(i)
20256,410,129 N/A14,276,330 N/A2,549,051 5,216,704 $697.80$497.97101,7812,812,356
20243,096,521 N/A8,540,114 N/A1,376,666 3,760,596 $383.52$348.6468,9351,823,889
20232,446,392 N/A4,035,080 N/A1,081,281 1,673,878 $200.88$238.9849,0011,563,548
20222,362,627 N/A1,381,406 N/A1,096,401 718,360 $144.12$185.4721,3761,301,674
20213,939,343 492,913 4,996,295 492,913 1,889,210 2,185,221 $183.35$171.9420,177910,739
        
Company Selected Measure Name Revenue        
Named Executive Officers, Footnote
Fred J. (Jule) Smith, III served as our principal executive officer (“PEO”) for each of fiscal 2025, 2024, 2023 and 2022 and a partial year in fiscal 2021. Charles E. Owens, our Vice Chairman, served as our PEO for a partial year in fiscal 2021. For fiscal 2025, our non-PEO NEOs were Messrs. Hoffman, Baugnon, Brooks, Fleming, Harper, and Armstrong. For fiscal 2024, our non-PEO NEOs were Messrs. Hoffman, Harper, Robert P. Flowers and Armstrong. For fiscal 2023, our non-PEO NEOs were Messrs. Hoffman, Harper, Flowers, Armstrong and R. Alan Palmer, who served as our Executive Vice President and Chief Financial Officer for a partial year in fiscal 2023. For fiscal 2022 and 2021, our non-PEO NEOs were Messrs. Palmer, Harper, Flowers and Armstrong.
        
Peer Group Issuers, Footnote
For each of fiscal 2025, 2024, 2023, 2022 and 2021, TSR for the Company and the peer group was calculated as the yearly percentage change in cumulative TSR based on a deemed fixed investment of $100 at market close on September 30, 2020. The yearly percentage change in cumulative TSR was measured as the quotient of (a) the sum of (i) the cumulative amount of dividends for the period from September 30, 2020 through and including the last day of the covered fiscal year (the “Measurement Period”), assuming dividend reinvestment, plus (ii) the difference between stock price per share at the end and the beginning of the Measurement Period, divided by (b) stock price per share at the beginning of the Measurement Period. The peer group (the “Peer Group”) TSR set forth in this table utilizes the Dow Jones U.S. Heavy Construction Index, which we also utilize in the stock performance graph required by Item 201(e) of Regulation S-K and included in our 2025 Annual Report.
        
PEO Total Compensation Amount $ 6,410,129 $ 3,096,521 $ 2,446,392 $ 2,362,627 $ 3,939,343
PEO Actually Paid Compensation Amount $ 14,276,331 8,540,113 4,035,081 1,381,407 4,996,296
Adjustment To PEO Compensation, Footnote
For each of fiscal 2025, 2024, 2023, 2022 and 2021, the values included in this column for the compensation actually paid to our then-current PEO and the average compensation actually paid to our non-PEO NEOs reflected the following adjustments to the values included in column (b) and column (d), respectively, in the table above. For the former PEO, compensation actually paid in fiscal 2021 was equal to the Summary Compensation Table (“SCT”) total.
Current PEO20252024202320222021
SCT Total for Current PEO (b)6,410,129 3,096,521 2,446,392 2,362,627 3,939,343 
- SCT “Stock Awards” column value-2,870,328 -964,775 -793,024 -1,179,480 -2,844,325 
+ year-end fair value of equity awards granted in the covered year that are outstanding and unvested as of the covered year-end2,522,413 1,550,146 878,179 946,098 3,770,802 
[+/-] year-over-year change in fair value of equity awards granted in prior years that are outstanding and unvested as of the covered year-end1,312,283 2,496,278 1,294,332 -775,882 — 
[+/-] change in fair value of equity awards granted in the covered year that vested in the covered year2,420,946 128,292 77,507 50,257 130,476 
[+/-] year-over-year change in fair value of equity awards granted in prior years that vested in the covered year4,480,888 2,233,651 131,695 -22,213 — 
Compensation Actually Paid to Current PEO (c)14,276,331 8,540,113 4,035,081 1,381,407 4,996,296 
        
Non-PEO NEO Average Total Compensation Amount $ 2,549,051 1,376,666 1,081,281 1,096,401 1,889,210
Non-PEO NEO Average Compensation Actually Paid Amount $ 5,216,704 3,760,596 1,673,878 718,360 2,185,221
Adjustment to Non-PEO NEO Compensation Footnote
For each of fiscal 2025, 2024, 2023, 2022 and 2021, the values included in this column for the compensation actually paid to our then-current PEO and the average compensation actually paid to our non-PEO NEOs reflected the following adjustments to the values included in column (b) and column (d), respectively, in the table above. For the former PEO, compensation actually paid in fiscal 2021 was equal to the Summary Compensation Table (“SCT”) total.
Average for Non-PEO NEOs (d)20252024202320222021
SCT Total for Non-PEO NEOs (d)2,549,051 1,376,666 1,081,281 1,096,401 1,889,210 
- SCT “Stock Awards” column value-1,272,476 -427,263 -303,469 -453,645 -1,141,819 
+ year-end fair value of equity awards granted in the covered year that are outstanding and unvested as of the covered year-end804,681 669,423 332,725 362,256 1,412,072 
[+/-] year-over-year change in fair value of equity awards granted in prior years that are outstanding and unvested as of the covered year-end461,973 1,099,946 480,738 -296,624 — 
[+/-] change in fair value of equity awards granted in the covered year that vested in the covered year1,207,806 67,881 32,889 21,273 25,757 
[+/-] year-over-year change in fair value of equity awards granted in prior years that vested in the covered year1,465,669 973,944 49,714 -11,301 — 
Compensation Actually Paid to Non-PEO NEOs (e)5,216,704 3,760,596 1,673,878 718,360 2,185,221 
        
Compensation Actually Paid vs. Total Shareholder Return
Relationship Between PEO and Average Non-PEO NEO
Compensation Actually Paid, Company TSR and Peer Group TSR

860
        
Compensation Actually Paid vs. Net Income
Relationship Between PEO and Average Non-PEO NEO Compensation Actually Paid and Net Income

956
        
Compensation Actually Paid vs. Company Selected Measure
Relationship Between PEO and Average Non-PEO NEO Compensation Actually Paid and Revenue
1049
        
Total Shareholder Return Vs Peer Group
Relationship Between PEO and Average Non-PEO NEO
Compensation Actually Paid, Company TSR and Peer Group TSR

860
        
Tabular List, Table
Revenue
Revenue growth
Adjusted EBITDA(1)
Adjusted EBITDA margin(1)
        
Total Shareholder Return Amount $ 697.80 383.52 200.88 144.12 183.35
Peer Group Total Shareholder Return Amount 497.97 348.64 238.98 185.47 171.94
Net Income (Loss) $ 101,781,000 $ 68,935,000 $ 49,001,000 $ 21,376,000 $ 20,177,000
Company Selected Measure Amount 2,812,356,000 1,823,889,000 1,563,548,000 1,301,674,000 910,739,000
Additional 402(v) Disclosure Adjusted EBITDA and Adjusted EBITDA margin are financial measures not presented in accordance with GAAP. Adjusted EBITDA represents net income before, as applicable from time to time, (i) interest expense, net, (ii) provision (benefit) for income taxes, (iii) depreciation, depletion, accretion and amortization, (iv) share-based compensation expense, (v) loss on the extinguishment of debt, (vi) nonrecurring expenses related to transformative acquisitions, which management considers to include transactions of a size that would require clearance under federal antitrust laws, and (vii) certain management fees and expenses (for periods commencing prior to September 30, 2023). Adjusted EBITDA margin represents Adjusted EBITDA as a percentage of revenues for the applicable period.        
Measure:: 1          
Pay vs Performance Disclosure          
Name Revenue        
Measure:: 2          
Pay vs Performance Disclosure          
Name Revenue growth        
Measure:: 3          
Pay vs Performance Disclosure          
Name Adjusted EBITDA(1)        
Measure:: 4          
Pay vs Performance Disclosure          
Name Adjusted EBITDA margin(1)        
Smith [Member]          
Pay vs Performance Disclosure          
PEO Total Compensation Amount $ 6,410,129 $ 3,096,521 $ 2,446,392 $ 2,362,627 $ 3,939,343
PEO Actually Paid Compensation Amount 14,276,330 8,540,114 4,035,080 1,381,406 4,996,295
Owens [Member]          
Pay vs Performance Disclosure          
PEO Total Compensation Amount         492,913
PEO Actually Paid Compensation Amount         492,913
PEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount (2,870,328) (964,775) (793,024) (1,179,480) (2,844,325)
PEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 2,522,413 1,550,146 878,179 946,098 3,770,802
PEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 1,312,283 2,496,278 1,294,332 (775,882) 0
PEO | Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 2,420,946 128,292 77,507 50,257 130,476
PEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 4,480,888 2,233,651 131,695 (22,213) 0
Non-PEO NEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount (1,272,476) (427,263) (303,469) (453,645) (1,141,819)
Non-PEO NEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 804,681 669,423 332,725 362,256 1,412,072
Non-PEO NEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 461,973 1,099,946 480,738 (296,624) 0
Non-PEO NEO | Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 1,207,806 67,881 32,889 21,273 25,757
Non-PEO NEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount $ 1,465,669 $ 973,944 $ 49,714 $ (11,301) $ 0