v3.26.1
Schedule H, Line 4i – Schedule of Assets (Held At End of Year) (Details) - EBP 001 - USD ($)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
EBP, Schedule of Asset Held for Investment [Line Items]    
Entity tax identification number 99-1952207  
Plan number 001  
Total investments $ 221,342,104  
EBP, Asset Held for Investment $ 224,989,102  
Minimum    
EBP, Schedule of Asset Held for Investment [Line Items]    
Participant loan, interest rate 4.25% 4.25%
Maximum    
EBP, Schedule of Asset Held for Investment [Line Items]    
Participant loan, interest rate 9.50% 9.50%
Notes Receivable from Participants    
EBP, Schedule of Asset Held for Investment [Line Items]    
Participant loan, current value $ 3,646,998  
Investment, Identifier [Axis]: Collective Trust Funds, Core Plus Fixed Income Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Total investments 2,906,136  
Investment, Identifier [Axis]: Collective Trust Funds, Retirement 2010 Trust Class F    
EBP, Schedule of Asset Held for Investment [Line Items]    
Total investments 889,414  
Investment, Identifier [Axis]: Collective Trust Funds, Retirement 2015 Trust Class F    
EBP, Schedule of Asset Held for Investment [Line Items]    
Total investments 2,024,591  
Investment, Identifier [Axis]: Collective Trust Funds, Retirement 2020 Trust Class F    
EBP, Schedule of Asset Held for Investment [Line Items]    
Total investments 6,076,947  
Investment, Identifier [Axis]: Collective Trust Funds, Retirement 2025 Trust Class F    
EBP, Schedule of Asset Held for Investment [Line Items]    
Total investments 9,934,699  
Investment, Identifier [Axis]: Collective Trust Funds, Retirement 2030 Trust Class F    
EBP, Schedule of Asset Held for Investment [Line Items]    
Total investments 12,913,620  
Investment, Identifier [Axis]: Collective Trust Funds, Retirement 2035 Trust Class F    
EBP, Schedule of Asset Held for Investment [Line Items]    
Total investments 13,548,681  
Investment, Identifier [Axis]: Collective Trust Funds, Retirement 2040 Trust Class F    
EBP, Schedule of Asset Held for Investment [Line Items]    
Total investments 15,970,906  
Investment, Identifier [Axis]: Collective Trust Funds, Retirement 2045 Trust Class F    
EBP, Schedule of Asset Held for Investment [Line Items]    
Total investments 15,782,746  
Investment, Identifier [Axis]: Collective Trust Funds, Retirement 2050 Trust Class F    
EBP, Schedule of Asset Held for Investment [Line Items]    
Total investments 10,366,898  
Investment, Identifier [Axis]: Collective Trust Funds, Retirement 2055 Trust Class F    
EBP, Schedule of Asset Held for Investment [Line Items]    
Total investments 8,659,375  
Investment, Identifier [Axis]: Collective Trust Funds, Retirement 2060 Trust Class F    
EBP, Schedule of Asset Held for Investment [Line Items]    
Total investments 3,697,938  
Investment, Identifier [Axis]: Collective Trust Funds, Retirement 2065 Trust Class F    
EBP, Schedule of Asset Held for Investment [Line Items]    
Total investments 631,810  
Investment, Identifier [Axis]: Collective Trust Funds, Retirement Balanced Trust Class F    
EBP, Schedule of Asset Held for Investment [Line Items]    
Total investments 668,094  
Investment, Identifier [Axis]: Collective Trust Funds, Small/Mid Cap Core Equity Fund - Class I    
EBP, Schedule of Asset Held for Investment [Line Items]    
Total investments 5,793,085  
Investment, Identifier [Axis]: Common Stock, Everus    
EBP, Schedule of Asset Held for Investment [Line Items]    
Total investments 10,145,135  
Investment, Identifier [Axis]: Common Stock, MDU Resources    
EBP, Schedule of Asset Held for Investment [Line Items]    
Total investments   $ 6,000,000.0
Investment, Identifier [Axis]: Fully Benefit-Responsive Investment Contract, New York Life Anchor Account III    
EBP, Schedule of Asset Held for Investment [Line Items]    
Total investments 9,093,440  
Investment, Identifier [Axis]: Mutual Funds, 500 Index Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Total investments 30,110,075  
Investment, Identifier [Axis]: Mutual Funds, Diversified Real Asset R6 Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Total investments 55,569  
Investment, Identifier [Axis]: Mutual Funds, EUPAC R6 Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Total investments 5,456,595  
Investment, Identifier [Axis]: Mutual Funds, Extended Market Index Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Total investments 7,692,422  
Investment, Identifier [Axis]: Mutual Funds, Inflation Protected Bond Instl Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Total investments 729,603  
Investment, Identifier [Axis]: Mutual Funds, International Value I Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Total investments 7,097,095  
Investment, Identifier [Axis]: Mutual Funds, Large-Cap Growth Fund - I Class    
EBP, Schedule of Asset Held for Investment [Line Items]    
Total investments 21,149,538  
Investment, Identifier [Axis]: Mutual Funds, Total International Index Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Total investments 3,116,981  
Investment, Identifier [Axis]: Mutual Funds, U.S. Bond Index Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Total investments 6,142,814  
Investment, Identifier [Axis]: Mutual Funds, U.S. Equity Research Fund - I Class    
EBP, Schedule of Asset Held for Investment [Line Items]    
Total investments $ 10,687,897