Construction Partners, Inc. Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Debt - Additional Information (Details)

Debt - Additional Information (Details)		3 Months Ended
Debt - Additional Information (Details)	Nov. 01, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2026	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2024 USD ($)	Jun. 30, 2022 USD ($)
Debt Instrument [Line Items]
Fixed coverage ratio		4.02					3.15
Leverage ratio		2.96					1.81
Interest rate swaps		$ 300,000,000					$ 300,000,000
Fair value of interest rate swaps		15,600,000					11,600,000
Proceeds from revolving credit facility		0	$ 90,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		400,000,000
Long-term debt		0					122,900,000
Remaining borrowing capacity		393,400,000					$ 268,800,000
Secured Debt \| Bridge Facility
Debt Instrument [Line Items]
Interest expense		$ 3,100,000
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity								$ 400,000,000
Line of Credit \| Secured Debt \| Term Loan A/Revolver Credit Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity								375,000,000
Line of Credit \| Secured Debt \| Initial Term Loan
Debt Instrument [Line Items]
Maximum borrowing capacity								250,000,000
Line of Credit \| Secured Debt \| Incremental Term Loan
Debt Instrument [Line Items]
Maximum borrowing capacity								125,000,000
Line of Credit \| Secured Debt \| Delayed Draw Term Facility
Debt Instrument [Line Items]
Maximum borrowing capacity								$ 50,000,000
Line of Credit \| Secured Debt \| Term Loan - 11 Quarters
Debt Instrument [Line Items]
Principal repayment rate		1.25%
Line of Credit \| Secured Debt \| Term Loan - 8 Quarters
Debt Instrument [Line Items]
Principal repayment rate		1.875%
Line of Credit \| Secured Debt \| Term Loan B Credit Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 850,000,000
Principal repayment rate	0.25%
Proceeds from revolving credit facility	$ 850,000,000
Line of Credit \| Secured Debt \| Maximum \| Credit Agreement
Debt Instrument [Line Items]
Leverage ratio							3.50
Line of Credit \| Secured Debt \| Maximum \| Credit Agreement \| Forecast
Debt Instrument [Line Items]
Leverage ratio				3.50	4.00	4.50
Line of Credit \| Secured Debt \| Term SOFR \| Term Loan
Debt Instrument [Line Items]
Basis spread on variable rate		0.10%
Line of Credit \| Secured Debt \| Term SOFR \| Term Loan B Credit Agreement \| Variable Rate Component One
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
Line of Credit \| Secured Debt \| Term SOFR \| Term Loan B Credit Agreement \| Variable Rate Component Two
Debt Instrument [Line Items]
Basis spread on variable rate	2.50%
Line of Credit \| Secured Debt \| Daily Simple SOFR \| Term Loan
Debt Instrument [Line Items]
Basis spread on variable rate		0.10%
Line of Credit \| Secured Debt \| Fed Funds Effective Rate Overnight Index Swap Rate \| Term Loan B Credit Agreement
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
Line of Credit \| Secured Debt \| Base Rate \| Term Loan B Credit Agreement \| Variable Rate Component One
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
Line of Credit \| Secured Debt \| Base Rate \| Term Loan B Credit Agreement \| Variable Rate Component Two
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
Term Loan
Debt Instrument [Line Items]
Long-term debt		$ 386,900,000					$ 392,200,000
Credit Agreement \| Minimum
Debt Instrument [Line Items]
Fixed coverage ratio		1.20
Term Loan B
Debt Instrument [Line Items]
Long-term debt		$ 850,000,000					$ 0