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EMPLOYEE BENEFIT PLANS - Multiemployer Plans (Details) - Asset Based $ in Thousands				3 Months Ended		12 Months Ended
	Aug. 01, 2022	Aug. 01, 2021	Aug. 01, 2020	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2022 USD ($) plan	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jan. 01, 2021	Jan. 01, 2020
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						56.00%
Percentage of contributions to the multiemployer pension plans that are in critical status						4.00%
Percentage of contributions to the multiemployer pension plans that are in endangered status						4.00%
Total multiemployer pension contributions paid						$ 154,558	$ 146,893	$ 142,194
Pension Plans | Central States Pension Plan and Central Pennsylvania Teamsters Pension Plan
Multiemployer Plans
Threshold percentage of the entity's contributions relative to total fund contributions, which was exceeded during the period							5.00%	5.00%
Pension Plans | Central States Pension Plan
Multiemployer Plans
Multiemployer pension contributions paid, individually significant						$ 75,306	$ 71,045	$ 68,704
Percentage of contributions to multiemployer pension plan						50.00%	50.00%	50.00%
Actuarially certified projected funded percentage of multiemployer pension plan									17.10%	19.50%
Pension Plans | Western Conference Of Teamsters Pension Plan
Multiemployer Plans
Multiemployer pension contributions paid, individually significant						$ 28,051	$ 25,861	$ 23,633
Pension Plans | Central Pennsylvania Teamsters Pension Plan
Multiemployer Plans
Multiemployer pension contributions paid, individually significant						14,421	13,931	13,485
Pension Plans | Local 710 Pension Fund
Multiemployer Plans
Multiemployer pension contributions paid, individually significant						9,838	9,553	$ 9,885
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 and Trucking Industry Pension Fund
Multiemployer Plans
Multiemployer pension contributions paid, individually significant						4,449	4,357	$ 4,464
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)				19 years
Pension Plans | Other Pension Plans
Multiemployer Plans
Multiemployer pension contributions paid, individually insignificant						$ 22,493	22,146	22,023
Pension Plans | Western Pennsylvania Teamsters And Employers Pension Fund
Multiemployer Plans
Percentage of contributions to individually insignificant multiemployer pension plan						1.00%
Pension Plans | New York State Teamsters Conference Pension and Retirement Fund
Multiemployer Plans
Percentage of contributions to individually insignificant multiemployer pension plan						1.00%
Pension Plans | North Jersey Welfare Fund
Multiemployer Plans
Percentage of contributions to 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						$ 194,400	$ 176,200	$ 163,800
Percentage increase in contribution rate for time worked related to benefit costs	4.30%	4.30%	4.00%

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- Definition

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

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Represents the projected funded percentage of a specified multiemployer pension plan.

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

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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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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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