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

Debt - Additional Information (Details)

v3.22.0.1

Debt - Additional Information (Details) $ in Millions	Dec. 31, 2021 USD ($)	Sep. 30, 2021 payment	Jun. 30, 2021 USD ($)
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit, maximum borrowing capacity \| $	$ 225.0		$ 225.0
Term Loan
Debt Instrument [Line Items]
Line of credit, maximum borrowing capacity \| $			$ 200.0
Term Loan - 11 Loan Payments
Debt Instrument [Line Items]
Interest rate, percentage		1.25%
Number of quarter end payment dates \| payment		11
Term Loan - Last 7 Loan Payments
Debt Instrument [Line Items]
Interest rate, percentage		1.875%
Number of quarter end payment dates \| payment		7

- Definition

Number of Quarter End Payment Dates

+ References

No definition available.

+ Details

Name:	road_NumberOfQuarterEndPaymentDates
Namespace Prefix:	road_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=road_TermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=road_TermLoan11LoanPaymentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=road_TermLoanLast7LoanPaymentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: