Schedule H, Line 4i - Schedule of Assets (Held At End Of Year) (Details) - EBP 002
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12 Months Ended |
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Dec. 31, 2025
USD ($)
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Plan Name |
OLD DOMINION 401(k) RETIREMENT PLAN
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| Entity Tax Identification Number |
56-0751714
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| EBP, Plan Number |
002
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 2,542,486,745
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| Investment, Identifier [Axis]: Collective Trust Funds: Kayne Anderson Rudnick, Mid Cap Core CIT Class 3 |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Kayne Anderson Rudnick [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 3,585
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| Investment, Identifier [Axis]: Collective Trust Funds: Vanguard, Institutional 500 Index Trust Unit Class C |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 308,705,132
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| Investment, Identifier [Axis]: Collective Trust Funds: Vanguard, Institutional Total International Stock Market Index Trust Unit Class C |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 216,112,253
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| Investment, Identifier [Axis]: Fully Benefit-Responsive Investment Contract: Empower, E I Fixed Account - Series Class V, contract value |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Empower [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 125,030,278
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| Investment, Identifier [Axis]: Mutual Funds: American, Washington Mutual Fund - R6 |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
American [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 51,560,065
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| Investment, Identifier [Axis]: Mutual Funds: JP Morgan, Smart Retirement 2025 Fund R5 |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
JP Morgan [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 51,725,386
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| Investment, Identifier [Axis]: Mutual Funds: JP Morgan, Smart Retirement 2030 Fund R5 |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
JP Morgan [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 90,918,998
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| Investment, Identifier [Axis]: Mutual Funds: JP Morgan, Smart Retirement 2035 Fund R5 |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
JP Morgan [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 112,721,076
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| Investment, Identifier [Axis]: Mutual Funds: JP Morgan, Smart Retirement 2040 Fund R5 |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
JP Morgan [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 92,836,658
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| Investment, Identifier [Axis]: Mutual Funds: JP Morgan, Smart Retirement 2045 Fund R5 |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
JP Morgan [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 91,227,215
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| Investment, Identifier [Axis]: Mutual Funds: JP Morgan, Smart Retirement 2050 Fund R5 |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
JP Morgan [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 88,622,240
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| Investment, Identifier [Axis]: Mutual Funds: JP Morgan, Smart Retirement 2055 Fund R5 |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
JP Morgan [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 85,658,961
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| Investment, Identifier [Axis]: Mutual Funds: JP Morgan, Smart Retirement 2060 Fund R5 |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
JP Morgan [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 44,437,381
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| Investment, Identifier [Axis]: Mutual Funds: JP Morgan, Smart Retirement 2065 Fund R5 |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
JP Morgan [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 16,860,312
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| Investment, Identifier [Axis]: Mutual Funds: JP Morgan, Smart Retirement Income Fund R5 |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
JP Morgan [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 24,142,309
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| Investment, Identifier [Axis]: Mutual Funds: JP Morgan, US Large Cap Core Plus Fund - Select |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
JP Morgan [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 62,464,213
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| Investment, Identifier [Axis]: Mutual Funds: Russell, US Small Cap Equity - Select |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Russell [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 26,823,375
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| Investment, Identifier [Axis]: Mutual Funds: Vanguard, Mid-Cap Index Fund Institutional Plus Shares |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 133,257,669
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| Investment, Identifier [Axis]: Mutual Funds: Vanguard, Small Cap Index Fund Institutional |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard [Member]
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 20,133,530
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| Investment, Identifier [Axis]: Old Dominion Freight Line, Inc., Common Stock |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Old Dominion Freight Line, Inc. [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 453,993,043
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| Investment, Identifier [Axis]: Participant Loans, 5.25% - 11.5%, maturing through December 2034 |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 96,179,941
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| Investment, Identifier [Axis]: Pooled Separate Accounts: Capital Group, EuroPacific Growth SA |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Capital Group [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 38,328,268
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| Investment, Identifier [Axis]: Pooled Separate Accounts: Jennison, Large Cap Growth / Jennison Fund |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Jennison [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 100,836,963
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| Investment, Identifier [Axis]: Pooled Separate Accounts: MetWest, Core Plus Bond Fund (IS Platform) |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
MetWest [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 193,297,325
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| Investment, Identifier [Axis]: Schwab, Self-directed brokerage accounts |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Schwab [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 16,610,569
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| Investment, Identifier [Axis]: Series of Transactions in Excess of Five Percent of Total Plan Assets: Vanguard Institutional 500 Index Trust |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard [Member]
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| Investment, Identifier [Axis]: Series of Transactions in Excess of Five Percent of Total Plan Assets: Vanguard Institutional 500 Index Trust Unit Class C |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard [Member]
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| Investment, Identifier [Axis]: Series of Transactions in Excess of Five Percent of Total Plan Assets: Vanguard Institutional Total International Stock Market Index Trust |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard [Member]
|
| Investment, Identifier [Axis]: Series of Transactions in Excess of Five Percent of Total Plan Assets: Vanguard Institutional Total International Stock Market Index Trust Unit Class C |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard [Member]
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| Investment, Identifier [Axis]: Single Transactions in Excess of Five Percent of Total Plan Assets: Vanguard Institutional 500 Index Trust |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard [Member]
|
| Investment, Identifier [Axis]: Single Transactions in Excess of Five Percent of Total Plan Assets: Vanguard Institutional 500 Index Trust Unit Class C |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard [Member]
|
| Investment, Identifier [Axis]: Single Transactions in Excess of Five Percent of Total Plan Assets: Vanguard Institutional Total International Stock Market Index Trust |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard [Member]
|
| Investment, Identifier [Axis]: Single Transactions in Excess of Five Percent of Total Plan Assets: Vanguard Institutional Total International Stock Market Index Trust Unit Class C |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard [Member]
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| Minimum |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Asset Held for Investment, Participant Loan, Interest Rate |
5.25%
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| Maximum |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Asset Held for Investment, Participant Loan, Interest Rate |
11.50%
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| EBP, Asset Held for Investment, Participant Loans, Maturity Date |
2035-12
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