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Business Acquisition - Additional Information (Details) $ in Thousands, shares in Millions |  |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
May 01, 2025 USD ($) | Feb. 03, 2025 USD ($) plant | Jan. 02, 2025 USD ($) plant | Nov. 01, 2024 USD ($) plant facility installment terminal shares | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) shares | Jun. 30, 2024 USD ($) | Sep. 30, 2024 USD ($)
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Accrued expenses and other current liabilities |  |  |  |  | $ 127,875 |  | $ 127,875 |  | $ 42,189
Goodwill |  |  |  |  | 775,756 |  | 775,756 |  | $ 231,656
Revenues since acquisition date |  |  |  |  | 193,900 |  | 385,000 |  |
Net income |  |  |  |  | 11,000 |  | 3,400 |  |
Expenses and losses recognized |  |  |  |  | 1,300 |  | 21,000 |  |
Acquisition related costs |  |  |  |  | 1,816 | $ 941 | 22,174 | $ 2,239 |
2025 Acquisitions |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 542,365 |  | 542,365 |  |
Acquisition related costs |  |  |  |  |  |  | 21,000 |  |
Lone Star Paving |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Number of hot-mix asphalt plants acquired | plant |  |  |  | 10 |  |  |  |  |
Number of aggregate facilities acquired | facility |  |  |  | 4 |  |  |  |  |
Number of liquid asphalt terminals acquired | terminal |  |  |  | 1 |  |  |  |  |
Consideration transferred |  |  |  | $ 659,000 |  |  |  |  |
Number of quarterly payments to selling unit holders | installment |  |  |  | 4 |  |  |  |  |
Total cash payments to selling unit holders |  |  |  | $ 30,000 |  |  |  |  |
Accrued expenses and other current liabilities |  |  |  |  | 66,800 |  | 66,800 |  |
Goodwill |  |  |  |  | 423,859 |  | $ 423,859 |  |
Lone Star Paving | Class A Common Stock |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Business acquisition, restricted shares (in shares) | shares |  |  |  | 3 |  |  | 3 |  |
Aggregate fair market value |  |  |  | $ 236,300 |  |  |  |  |
Oklahoma Acquisition |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Consideration transferred |  |  | $ 121,100 |  |  |  |  |  |
Number of hot-mix asphalt plants | plant |  |  | 8 |  |  |  |  |  |
Goodwill |  |  |  |  | 68,422 |  | $ 68,422 |  |
Alabama Acquisition |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Number of hot-mix asphalt plants acquired | plant |  | 5 |  |  |  |  |  |  |
Consideration transferred |  | $ 55,100 |  |  |  |  |  |  |
Goodwill |  |  |  |  | 18,535 |  | 18,535 |  |
Tennessee Acquisition |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Consideration transferred | $ 96,100 |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 31,549 |  | $ 31,549 |  |

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