Name:	abfs_DeferredCompensationCashbasedArrangementsLiabilityNoncurrent
Namespace Prefix:	abfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the minimum period prior to the end of the performance period for making an election to defer receipt of a portion of salary and incentive compensation.

No definition available.

Name:	abfs_DeferredCompensationPlanMinimumPeriodForElectionToDeferBenefits
Namespace Prefix:	abfs_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the maximum percentage of the salary, the plan participants are permitted to defer under the 401(k) plans.

No definition available.

Name:	abfs_DefinedContributionPlan401KPlanMaximumPercentageOfSalaryPermittedToBeDeferredByPlanParticipants
Namespace Prefix:	abfs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the percentage rate at which the employer matches the eligible percentage of participants' compensation.

No definition available.

Name:	abfs_DefinedContributionPlan401KPlanRateOfEmployerMatch
Namespace Prefix:	abfs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The minimum period that the individual is required to perform services in order to be fully vested under the deferred compensation arrangement.

No definition available.

Name:	abfs_DefinedContributionPlanRequisiteServicePeriod
Namespace Prefix:	abfs_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the recognized gains associated with changes in the cash surrender value and proceeds from life insurance policies.

No definition available.

Name:	abfs_LifeInsurancePolicyRecognizedGains
Namespace Prefix:	abfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Name:	abfs_LongTermCashIncentivePlanAbstract
Namespace Prefix:	abfs_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Represents the earning period of incentives under the Long-Term Cash Incentive Plan.

No definition available.

Name:	abfs_LongTermCashIncentivePlanEarningPeriod
Namespace Prefix:	abfs_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Name:	abfs_OtherPlansAbstract
Namespace Prefix:	abfs_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 17

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 4

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6812-107765

Name:	us-gaap_CashSurrenderValueOfLifeInsurance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

No definition available.

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

Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

Name:	us-gaap_DeferredCompensationPlanAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

The amount of the cost recognized during the period for defined contribution plans.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

No definition available.