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

Related Parties - Schedule of Related Party Transactions (Details) - Affiliated Entity - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Sep. 30, 2021
Purchaser of Subsidiary
Related Party Transaction [Line Items]
Revenue Earned (Expense Incurred)	$ 0	$ 0	$ 0	$ 0
Accounts Receivable (Payable)	518		518		$ 518
Disposed Entity
Related Party Transaction [Line Items]
Revenue Earned (Expense Incurred)	0	0	0	0
Accounts Receivable (Payable)	330		330		330
Land Development Project
Related Party Transaction [Line Items]
Revenue Earned (Expense Incurred)	0	7	0	8
Accounts Receivable (Payable)	707		707		788
Subcontracting Services
Related Party Transaction [Line Items]
Revenue Earned (Expense Incurred)	(2,596)	(2,689)	(5,688)	(5,292)
Accounts Receivable (Payable)	(400)		(400)		(563)
Construction Services
Related Party Transaction [Line Items]
Revenue Earned (Expense Incurred)	0	17	0	136
Accounts Receivable (Payable)	0		0		0
Island Pond
Related Party Transaction [Line Items]
Revenue Earned (Expense Incurred)	(80)	(80)	(240)	(240)
Accounts Receivable (Payable)	0		0		0
Vehicles - Purchases
Related Party Transaction [Line Items]
Revenue Earned (Expense Incurred)	0	(128)	0	(536)
Accounts Receivable (Payable)	0		0		0
Vehicles - Rent Expense
Related Party Transaction [Line Items]
Revenue Earned (Expense Incurred)	0	(31)	0	(158)
Accounts Receivable (Payable)	0		0		0
SunTx
Related Party Transaction [Line Items]
Revenue Earned (Expense Incurred)	(370)	$ (412)	(1,129)	$ (1,550)
Accounts Receivable (Payable)	$ 0		$ 0		$ 0