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

Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation - Additional Information (Details)

Share-Based Compensation - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended		9 Months Ended
	Mar. 31, 2024 USD ($) installment shares	Mar. 31, 2023 USD ($)	Mar. 31, 2024 USD ($) installment shares	Mar. 31, 2023 USD ($)	Mar. 31, 2024 USD ($) installment shares	Sep. 30, 2023 USD ($)	May 31, 2021 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 3,553	$ 2,692	$ 6,599	$ 5,172
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate grant date fair value			3,500
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate grant date fair value			$ 2,700
Shares issued (in shares) \| shares			55,358
Number of restricted stock vest (in shares) \| shares			62,283
Shares issued (in shares) \| shares			83,044
Performance Shares \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of final number of of common stock issuable upon vesting of performance stock units			0
Performance Shares \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of final number of of common stock issuable upon vesting of performance stock units			1.50
Percentage increase (decrease) of awards granted due to total shareholder return ranking			0.15
Liability classified awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate grant date fair value			$ 5,100
Compensation expense	776	0	882	0
Current liability for cash-settled restricted stock units	900		900		$ 900	$ 0
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 221	0	$ 378	$ 0
Shares issued (in shares) \| shares					29,899
Maximum number of shares offered under the ESPP (in shares) \| shares							1,000,000
Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of stock grant awards (in shares) \| shares	55,358
Class A Common Stock \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issues (in shares) \| shares			80,113
Class A Common Stock \| Restricted Stock \| Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 2,000		$ 4,400
Unrecognized compensation expense	8,900		$ 8,900		$ 8,900
Unrecognized compensation expense, period for recognition (years)			2 years 7 months 6 days
Class A Common Stock \| Performance Shares \| Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	600		$ 1,000
Unrecognized compensation expense	$ 4,100		$ 4,100		4,100
Unrecognized compensation expense, period for recognition (years)			2 years 3 months 18 days
Class A Common Stock \| Liability classified awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued (in shares) \| shares	114,264
Class A Common Stock \| Liability classified awards \| Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 800	$ 900
Unrecognized compensation expense	$ 4,200		$ 4,200		$ 4,200
Unrecognized compensation expense, period for recognition (years)	3 years 6 months
Requisite service period, number of equal annual installments \| installment	4		4		4