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LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Financing arrangements - Letters of credit & Surety bonds) (Details) $ in Millions | Sep. 30, 2020 USD ($)
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Accounts receivable securitization borrowings |
Financing Arrangements |
Outstanding letters of credit | $ 11.7
Letters Of Credit Agreements |
Financing Arrangements |
Outstanding letters of credit | 12.3
Surety bonds |
Financing Arrangements |
Outstanding surety bonds under uncollateralized bond programs | $ 61.6

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- Definition Represents the total amount of outstanding surety bonds under the uncollateralized bond program related to the self-insurance program as of the reporting date. + References No definition available. + Details
Name: | arcb_SuretyBondsAmountOutstandingUnderUncollateralizedProgram
Namespace Prefix: | arcb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_DebtInstrumentAxis=arcb_AccountsReceivableSecuritizationProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=arcb_LettersOfCreditAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=us-gaap_SuretyBondMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |