Construction Partners, Inc. Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Subsequent Events (Details)

Subsequent Events (Details)		1 Months Ended		12 Months Ended
Subsequent Events (Details)	Nov. 01, 2024 USD ($) plant facility terminal installment shares	Nov. 25, 2024 shares	Oct. 31, 2024 shares	Sep. 30, 2024 shares	Dec. 31, 2026	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2023
Line of Credit
Subsequent Event [Line Items]
Leverage ratio				1.81				1.72
Term Loan \| Maximum \| Credit Agreement \| Line of Credit
Subsequent Event [Line Items]
Leverage ratio				3.50
Subsequent Event \| Term Loan \| Term Loan B Credit Agreement \| Line of Credit
Subsequent Event [Line Items]
Maximum borrowing capacity	$ 850,000,000
Line of credit, principal repayment rate	0.25%
Proceeds from lines of credit	$ 850,000,000
Subsequent Event \| Term Loan \| Term Loan B Credit Agreement \| Federal Funds \| Line of Credit
Subsequent Event [Line Items]
Basis spread on variable rate	0.50%
Subsequent Event \| Term Loan \| Term Loan B Credit Agreement \| Variable Rate Component One \| Term SOFR \| Line of Credit
Subsequent Event [Line Items]
Basis spread on variable rate	1.00%
Subsequent Event \| Term Loan \| Term Loan B Credit Agreement \| Variable Rate Component One \| Base Rate \| Line of Credit
Subsequent Event [Line Items]
Basis spread on variable rate	1.00%
Subsequent Event \| Term Loan \| Term Loan B Credit Agreement \| Variable Rate Component Two \| Term SOFR \| Line of Credit
Subsequent Event [Line Items]
Basis spread on variable rate	2.50%
Subsequent Event \| Term Loan \| Term Loan B Credit Agreement \| Variable Rate Component Two \| Base Rate \| Line of Credit
Subsequent Event [Line Items]
Basis spread on variable rate	1.50%
Subsequent Event \| Term Loan \| Maximum \| Forecast \| Credit Agreement \| Line of Credit
Subsequent Event [Line Items]
Leverage ratio					3.50	4.00	4.50
Class A Common Stock \| Restricted Stock \| Equity Incentive Plan
Subsequent Event [Line Items]
Vesting of restricted stock, shares withheld for taxes \| shares				33,772
Class A Common Stock \| Subsequent Event \| Restricted Stock \| Equity Incentive Plan
Subsequent Event [Line Items]
Vesting of restricted stock, shares withheld for taxes \| shares			120,847
Class B Common Stock \| Subsequent Event \| Restricted Stock \| Equity Incentive Plan
Subsequent Event [Line Items]
Vesting of restricted stock, shares withheld for taxes \| shares		2,653
Lone Star Paving Acquisition \| Subsequent Event
Subsequent Event [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
Total cash consideration transferred	$ 654,200,000
Number of quarterly payments to selling unit holders \| installment	4
Total cash payments to selling unit holders	$ 30,000,000
Lone Star Paving Acquisition \| Class A Common Stock \| Subsequent Event
Subsequent Event [Line Items]
Business acquisition, restricted shares (in shares) \| shares	3,000,000
Aggregate fair market value	$ 238,900,000
Lone Star Paving Acquisition \| Class A Common Stock \| Subsequent Event \| Key Employees of Lone Star Paving \| Restricted Stock
Subsequent Event [Line Items]
Business acquisition, restricted shares (in shares) \| shares	180,000
Aggregate fair market value	$ 14,200,000
Lone Star Paving Acquisition \| Class A Common Stock \| Subsequent Event \| Certain Officers and Employees \| Restricted Stock
Subsequent Event [Line Items]
Business acquisition, restricted shares (in shares) \| shares	85,000
Aggregate fair market value	$ 6,300,000
Transaction bonuses	$ 2,700,000
Lone Star Paving Acquisition \| Class B Common Stock \| Subsequent Event \| Certain Officers and Employees \| Restricted Stock
Subsequent Event [Line Items]
Business acquisition, restricted shares (in shares) \| shares	55,000
Aggregate fair market value	$ 4,100,000