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

Provision for Income Taxes (Details)	3 Months Ended		6 Months Ended
Provision for Income Taxes (Details)	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Effective tax rate, percent	23.50%	23.50%	21.80%	28.40%