Amount of pre-tax expenses associated with multiemployer pension fund withdrawal liability.

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Represents the maximum funded percentage of plans in the yellow zone.

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Represents the minimum funded percentage of plans in the yellow zone.

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Represents the percentage of the entity's contributions to multiemployer pension plans that are made to the specified plan.

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Represents the percentage of the entity's contributions to multiemployer pension plans that are made to plans in critical and declining status.

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Represents the percentage of the entity's contributions to multiemployer pension plans that are made to plans in critical status.

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Represents the percentage of the entity's contributions to multiemployer pension plans that are made to plans in endangered status.

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Amount of contributions made to multiemployer plan by employer related to pension fund withdrawal liability.

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Represents the threshold percentage of the entity's contributions to the plan relative to total contributions received by the plan, which was exceeded during the period, triggering disclosure of the plan year.

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Represents the percentage of the entity's contributions to each individually insignificant multiemployer pension plan.

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The threshold funded percentage of plans, below which a higher maximum period for insolvency is used to determine "critical and declining" status.

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The threshold ratio of inactive participants to active participants, above which a higher maximum period for insolvency is used to determine "critical and declining" status.

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The maximum period within which a plan in "critical and declining" status is expected to become insolvent, unless additional criteria relating to ratio of inactive to active participants or funded percentage are applicable.

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The maximum period within which a plan in "critical and declining" status is expected to become insolvent, if additional criteria relating to ratio of inactive to active participants or funded percentage are applicable.

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The period of time over which monthly payments have to be made for withdrawal liability settlement for multiemployer plan, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Represents the number of multiemployer plans to which the reporting entity currently contributes.

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Amount of cash outflow for initial lumpsum payment of withdrawal liability from multiemployer plan.

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Increase (decrease) in employer's contractual contribution rate to multiemployer plan.

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Amount of cost for employer contribution to multiemployer plan. Multiemployer plan includes, but is not limited to, pension plan determined to be individually significant and insignificant and other postretirement benefit plan.

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EMPLOYEE BENEFIT PLANS - Multiemployer Plans (Details) - Asset Based $ in Thousands				3 Months Ended		12 Months Ended
	Aug. 01, 2023	Aug. 01, 2022	Aug. 01, 2021	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2023 USD ($) plan	Jan. 31, 2023	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jan. 01, 2023	Jan. 01, 2022	Jan. 01, 2021
Multiemployer Plans
Minimum funded percentage of plans in green zone						80.00%
Pension Plans
Multiemployer Plans
Number of multiemployer plans to which ABF Freight currently contributes \| plan						25
Maximum funded percentage of plans in yellow zone						80.00%
Maximum funded percentage of plans in red zone						65.00%
Maximum projected time to insolvency for plans in "critical and declining" status						14 years
Maximum projected time to insolvency for plans in "critical and declining" status if additional criteria apply						19 years
Threshold ratio of inactive to active participants for greater insolvency period to determine "critical and declining" status						2
Threshold funded percentage for greater insolvency period to determine "critical and declining" status						80.00%
Percentage of contributions to the multiemployer pension plans that are in critical and declining status						6.00%
Percentage of contributions to the multiemployer pension plans that are in critical status						53.00%
Percentage of contributions to the multiemployer pension plans that are in endangered status						0.00%
Total multiemployer pension contributions paid						$ 162,484		$ 154,558	$ 146,893
Pension Plans \| Central States, Southeast and Southwest Areas Pension Plan
Multiemployer Plans
Multiemployer pension contributions paid, individually significant						$ 77,708		$ 75,306	$ 71,045
Threshold percentage of the entity's contributions relative to total fund contributions, which was exceeded during the period								5.00%	5.00%
Percentage of contributions to multiemployer pension plan						50.00%		50.00%	50.00%
Actuarially certified projected funded percentage of multiemployer pension plan										97.50%	14.50%	17.10%
Pension Plans \| Western Conference Of Teamsters Pension Plan
Multiemployer Plans
Multiemployer pension contributions paid, individually significant						$ 29,540		$ 28,051	$ 25,861
Pension Plans \| Central Pennsylvania Teamsters Defined Benefit Plan(
Multiemployer Plans
Multiemployer pension contributions paid, individually significant						15,540		14,421	13,931
Pension Plans \| I. B. of T. Union Local No. 710 Pension Fund
Multiemployer Plans
Multiemployer pension contributions paid, individually significant						10,676		9,838	9,553
Threshold percentage of the entity's contributions relative to total fund contributions, which was exceeded during the period							5.00%
Pension Plans \| New England Teamsters Pension Fund
Multiemployer Plans
Multiemployer pension contributions paid, individually significant						4,636		4,449	4,357
Contributions to multiemployer plans related to pension fund withdrawal liability						1,600		1,600	1,600
Multiemployer pension fund withdrawal liability charge (pre-tax)					$ 37,900
Initial lump sum payment of withdrawal liability				$ 15,100
Withdrawal liability monthly payments period (in years)				18 years
Pension Plans \| All other plans in the aggregate
Multiemployer Plans
Multiemployer pension contributions paid, individually insignificant						$ 24,384		22,493	22,146
Pension Plans \| Multiemployer pension plans receiving 1% to 2% ABF Freight's total multiemployer pension contributions \| Minimum
Multiemployer Plans
Percentage of contributions to each individually insignificant multiemployer pension plan						1.00%
Pension Plans \| Multiemployer pension plans receiving 1% to 2% ABF Freight's total multiemployer pension contributions \| Maximum
Multiemployer Plans
Percentage of contributions to each individually insignificant multiemployer pension plan						2.00%
Health And Welfare Plans
Multiemployer Plans
Number of multiemployer plans to which ABF Freight currently contributes \| plan						38
Total multiemployer pension contributions paid						$ 215,600		$ 194,400	$ 176,200
Percentage increase in contribution rate for time worked related to benefit costs	5.70%	4.30%	4.30%