| Document and Entity Information | Oct. 30, 2024 |
| Cover [Abstract] | |
| Amendment Flag | true |
| Entity Central Index Key | 0001718227 |
| Document Type | 8-K/A |
| Document Period End Date | Oct. 30, 2024 |
| Entity Registrant Name | CONSTRUCTION PARTNERS, INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-38479 |
| Entity Tax Identification Number | 26-0758017 |
| Entity Address, Address Line One | 290 Healthwest Drive |
| Entity Address, Address Line Two | Suite 2 |
| Entity Address, City or Town | Dothan |
| Entity Address, State or Province | AL |
| Entity Address, Postal Zip Code | 36303 |
| City Area Code | (334) |
| Local Phone Number | 673-9763 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Class A common stock, $0.001 par value |
| Trading Symbol | ROAD |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Amendment Description | On November 4, 2024, Construction Partners, Inc. (the “Company”) filed with the U.S. Securities and Exchange Commission (“SEC”) a Current Report on Form 8-K (the “Original Form 8-K”) in connection with the completion of the Company’s acquisition of Asphalt Inc., LLC (doing business as Lone Star Paving), a Texas limited liability company (“Lone Star”), pursuant to that certain Unit Purchase Agreement, dated as of October 20, 2024, by and among the Company, Lone Star, the individual sellers listed on the signature pages thereto (the “Sellers”) and John J. Wheeler, in his capacity as the Sellers’ representative thereunder (the “Acquisition”). This Current Report on Form 8-K/A (this “Amendment”) amends the Original Form 8-K to provide the historical financial statements and pro forma financial information required by Items 9.01(a) and (b) of Form 8-K, which were omitted from the Original Report as permitted by paragraphs (a)(3) and (b)(2) of Item 9.01 of Form 8-K. The presentation of the Target Financial Statements (defined below), including the level of detail provided therein, is not necessarily indicative of how the Company intends to present its financial results in the future. The pro forma financial information included in this Amendment has been presented for informational purposes only, as required by Form 8-K. Such pro forma financial information does not purport to represent the actual results of operations that the Company would have achieved had it completed the Acquisition prior to the periods presented in the pro forma financial information, and it is not intended as a projection of the future results of operations that the Company may achieve after the Acquisition. No other amendments are being made to the Original Form 8-K by this Amendment. This Amendment should be read in conjunction with the Original Form 8-K, which provides a more complete description of the Acquisition. |
