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

Annual report pursuant to Section 13 and 15(d)

Business Acquisitions - Additional Information (Details)

Business Acquisitions - Additional Information (Details) $ in Thousands								12 Months Ended
	Sep. 10, 2024 USD ($)	Aug. 01, 2024 USD ($) plant	Jun. 03, 2024 USD ($)	May 01, 2024 USD ($) shares	Dec. 29, 2023 USD ($) equal_payment shares	Nov. 01, 2023 USD ($) plant	Oct. 02, 2023 USD ($)	Sep. 30, 2024 USD ($) acquisition	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)
Business Acquisition [Line Items]
Goodwill								$ 231,656	$ 159,270	$ 129,465
General and administrative expenses								1,500	$ 300	$ 800
Hubbard Paving & Grading, Inc. Acquisition
Business Acquisition [Line Items]
Total cash consideration transferred							$ 3,000
Reeves Construction Company Acquisition
Business Acquisition [Line Items]
Total cash consideration transferred						$ 18,300
Number of plants acquired \| plant						3
SJ&L General Contractor, LLC Acquisition (Provisional)
Business Acquisition [Line Items]
Total cash consideration transferred					$ 57,100
Business acquisition, non-compete agreement term					5 years
Business combination, agreement payment					$ 1,900
Business combination, number of equity payment \| equal_payment					10
Business combination, agreement payable term					6 months
Goodwill								15,857
SJ&L General Contractor, LLC Acquisition (Provisional) \| Restricted Common Class A
Business Acquisition [Line Items]
Stock issued in acquisition (in shares) \| shares					22,791
Value of stock issued in acquisition					$ 1,000
Littlefield Construction Company Acquisition
Business Acquisition [Line Items]
Total cash consideration transferred								6,500
Sunbelt Asphalt Surfaces, Inc. Acquisition (Provisional)
Business Acquisition [Line Items]
Total cash consideration transferred				$ 29,200
Goodwill								9,268
Sunbelt Asphalt Surfaces, Inc. Acquisition (Provisional) \| Restricted Common Class A
Business Acquisition [Line Items]
Stock issued in acquisition (in shares) \| shares				30,000
Value of stock issued in acquisition				$ 1,500
Sunbelt Asphalt Surfaces, Inc. Acquisition (Provisional) \| Performance Class A Common Stock
Business Acquisition [Line Items]
Stock issued in acquisition (in shares) \| shares				30,000
Value of stock issued in acquisition				$ 1,500
Hudson Paving, Inc. Acquisition (Provisional)
Business Acquisition [Line Items]
Total cash consideration transferred			$ 19,100
Goodwill								5,396
Robinson Paving Company Acquisition (Provisional)
Business Acquisition [Line Items]
Total cash consideration transferred		$ 59,500
Number of plants acquired \| plant		3
Goodwill								18,600
John G. Walton Construction Company, Inc. Acquisition (Provisional)
Business Acquisition [Line Items]
Total cash consideration transferred	$ 38,900
Goodwill								12,529
2024 Acquisition
Business Acquisition [Line Items]
Total cash consideration transferred								$ 231,700
Number of acquisitions during period \| acquisition								8
Goodwill								$ 70,954
Business acquisition, included combined equity period								12 months
Contract receivables including retainage								$ 41,000
Revenues since acquisition date								119,200
Net income								4,500
2023 Acquisitions - Final
Business Acquisition [Line Items]
Change in goodwill due to purchase price allocations								$ 1,400