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

Quarterly report pursuant to Section 13 or 15(d)

Related Parties - Schedule of Related Party Transactions (Details)

Related Parties - Schedule of Related Party Transactions (Details) - Affiliated Entity - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Sep. 30, 2020
Purchaser of Subsidiary
Related Party Transaction [Line Items]
Revenue Earned (Expense Incurred)	$ 0	$ 0	$ 0	$ 0
Accounts Receivable (Payable)	621		621		$ 621
Disposed Entity
Related Party Transaction [Line Items]
Revenue Earned (Expense Incurred)	0	0	0	0
Accounts Receivable (Payable)	396		396		396
Land Development Project
Related Party Transaction [Line Items]
Revenue Earned (Expense Incurred)	1	0	1	0
Accounts Receivable (Payable)	775		775		774
Subcontracting Services
Related Party Transaction [Line Items]
Revenue Earned (Expense Incurred)	(425)	(448)	(2,603)	(2,025)
Accounts Receivable (Payable)	(362)		(362)		(654)
Construction Services
Related Party Transaction [Line Items]
Revenue Earned (Expense Incurred)	119	254	119	1,534
Accounts Receivable (Payable)	211		211		123
Island Pond
Related Party Transaction [Line Items]
Revenue Earned (Expense Incurred)	(80)	(80)	(160)	(160)
Accounts Receivable (Payable)	0		0		0
Vehicles - Purchases
Related Party Transaction [Line Items]
Revenue Earned (Expense Incurred)	(98)	(64)	(408)	(114)
Accounts Receivable (Payable)	0		0		0
Vehicles - Rent Expense
Related Party Transaction [Line Items]
Revenue Earned (Expense Incurred)	(49)	(198)	(127)	(401)
Accounts Receivable (Payable)	0		0		0
Consulting Services
Related Party Transaction [Line Items]
Revenue Earned (Expense Incurred)	0	(72)	(32)	(143)
Accounts Receivable (Payable)	0		0		0
SunTx
Related Party Transaction [Line Items]
Revenue Earned (Expense Incurred)	(521)	$ (357)	(1,138)	$ (671)
Accounts Receivable (Payable)	$ 0		$ 0		$ 0