v3.26.1
Schedule H, Line 4i – Schedule of Assets (Held At End of Year) (Details) - EBP 001
$ in Thousands
12 Months Ended
Dec. 31, 2025
USD ($)
shares
EBP, Schedule of Asset Held for Investment [Line Items]  
Entity tax identification number 52-1188014
Plan number 003
Participant loan $ 29,660
Total investments at fair value $ 1,216,833
Minimum  
EBP, Schedule of Asset Held for Investment [Line Items]  
Participant loan interest rate 4.25%
Maximum  
EBP, Schedule of Asset Held for Investment [Line Items]  
Participant loan interest rate 9.50%
Registered investment companies  
EBP, Schedule of Asset Held for Investment [Line Items]  
Total investments at fair value $ 317,046
Common collective trusts  
EBP, Schedule of Asset Held for Investment [Line Items]  
Total investments at fair value $ 615,839
Investment, Identifier [Axis]: Common Stock | NS Stock Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 2,648,552
Total investments at fair value $ 254,288
Investment, Identifier [Axis]: The Vanguard Group, Inc. | Vanguard Cash Reserve Federal MM Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 43,877
Total investments at fair value $ 44
Investment, Identifier [Axis]: The Vanguard Group, Inc. | Vanguard Growth Index Fund Institutional Shares  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 428,367
Total investments at fair value $ 107,584
Investment, Identifier [Axis]: The Vanguard Group, Inc. | Vanguard Inflation-Protected Securities Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 1,065,483
Total investments at fair value $ 9,973
Investment, Identifier [Axis]: The Vanguard Group, Inc. | Vanguard Institutional 500 Index Trust C  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 924,513
Total investments at fair value $ 128,896
Investment, Identifier [Axis]: The Vanguard Group, Inc. | Vanguard Institutional Total Bond Market Index Trust C  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 543,473
Total investments at fair value $ 59,864
Investment, Identifier [Axis]: The Vanguard Group, Inc. | Vanguard Institutional Total International Stock Market Index Trust C  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 629,882
Total investments at fair value $ 88,624
Investment, Identifier [Axis]: The Vanguard Group, Inc. | Vanguard Mid-Cap Index Fund Institutional Shares  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 476,781
Total investments at fair value $ 37,847
Investment, Identifier [Axis]: The Vanguard Group, Inc. | Vanguard Retirement Savings Trust III  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 54,403,361
Total investments at fair value $ 54,403
Investment, Identifier [Axis]: The Vanguard Group, Inc. | Vanguard Small-Cap Index Fund Institutional Shares  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 195,864
Total investments at fair value $ 24,205
Investment, Identifier [Axis]: The Vanguard Group, Inc. | Vanguard Target Retirement 2020 Trust I  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 66,435
Total investments at fair value $ 5,638
Investment, Identifier [Axis]: The Vanguard Group, Inc. | Vanguard Target Retirement 2025 Trust I  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 152,661
Total investments at fair value $ 14,046
Investment, Identifier [Axis]: The Vanguard Group, Inc. | Vanguard Target Retirement 2030 Trust I  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 291,276
Total investments at fair value $ 28,510
Investment, Identifier [Axis]: The Vanguard Group, Inc. | Vanguard Target Retirement 2035 Trust I  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 380,276
Total investments at fair value $ 39,975
Investment, Identifier [Axis]: The Vanguard Group, Inc. | Vanguard Target Retirement 2040 Trust I  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 389,859
Total investments at fair value $ 44,370
Investment, Identifier [Axis]: The Vanguard Group, Inc. | Vanguard Target Retirement 2045 Trust I  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 422,831
Total investments at fair value $ 50,643
Investment, Identifier [Axis]: The Vanguard Group, Inc. | Vanguard Target Retirement 2050 Trust I  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 347,770
Total investments at fair value $ 43,040
Investment, Identifier [Axis]: The Vanguard Group, Inc. | Vanguard Target Retirement 2055 Trust I  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 195,143
Total investments at fair value $ 29,451
Investment, Identifier [Axis]: The Vanguard Group, Inc. | Vanguard Target Retirement 2060 Trust I  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 167,940
Total investments at fair value $ 13,321
Investment, Identifier [Axis]: The Vanguard Group, Inc. | Vanguard Target Retirement 2065 Trust I  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 122,004
Total investments at fair value $ 5,951
Investment, Identifier [Axis]: The Vanguard Group, Inc. | Vanguard Target Retirement 2070 Trust I  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 57,874
Total investments at fair value $ 1,721
Investment, Identifier [Axis]: The Vanguard Group, Inc. | Vanguard Target Retirement Income Trust I  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 97,601
Total investments at fair value $ 7,386
Investment, Identifier [Axis]: The Vanguard Group, Inc. | Vanguard Value Index Fund Institutional Shares  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 546,811
Total investments at fair value $ 40,743
Investment, Identifier [Axis]: The Vanguard Group, Inc. | Vanguard Wellington Fund Admiral Shares  
EBP, Schedule of Asset Held for Investment [Line Items]  
Number of Shares/Units (in shares) | shares 1,252,105
Total investments at fair value $ 96,650