Cover	12 Months Ended
Cover	Dec. 31, 2023
Document Information [Line Items]
Document Type	DEF 14A
Amendment Flag	false
Entity Information [Line Items]
Entity Registrant Name	Knife River Corporation
Entity Central Index Key	0001955520

Pay vs Performance Disclosure

12 Months Ended

Dec. 31, 2023

USD ($)

$ / shares

Pay vs Performance Disclosure

Pay vs Performance Disclosure, Table


	Summary Compensation Table Total Compensation for Principal Executive Officer (PEO) ($)(2)	Compensation Actually Paid to PEO ($)(3)	Average Summary Compensation Table Total Compensation for Non-PEO Named Executive Officers ($)(4)	Average Compensation Actually Paid to Non-PEO Named Executive Officers ($)(5)	Value of initial fixed $100 investment based on:		Net Income (in thousands) ($)(8)	Company Selected Measure - Adjusted EBITDA (in thousands) ($)(9)
Year(1)					Total Stockholder Return ($)(6)	Peer Group Total Stockholder Return ($)(7)
2023	4,991,482	6,535,447	1,835,172	2,665,370	188.98	120.11	182,872	432,421

Named Executive Officers, Footnote

Our PEO for 2023 was Brian R. Gray. Our non-PEO named executive officers for 2023 were Nathan W. Ring, Trevor J. Hastings, Karl A. Liepitz and Nancy K. Christenson.

Peer Group Issuers, Footnote

Represents the value of $100 invested in the S&P 400 Materials Index on June 1, 2023 (the date we become a publicly traded company), which is used for the company’s stock performance graph in the 2023 Annual Report, assuming dividends are reinvested in the compensation peer group stock at the frequency paid.

PEO Total Compensation Amount

$ 4,991,482

PEO Actually Paid Compensation Amount

$ 6,535,447

Adjustment To PEO Compensation, Footnote

To arrive at CAP for Mr. Gray, total compensation as reported in the SCT was adjusted for the following:


			2023
SCT Total Compensation for the PEO			4,991,482
less: Reported Value of Stock Awards in the SCT(a)			2,620,279
plus: Stock Award Adjustments(b)			4,164,244
less: Change in Actuarial Present Value of Defined Benefit and Pension Plans as Reported in the SCT			—
plus: Aggregate Service Cost and Prior Service Costs on Defined Benefit and Pension Plans			—
CAP for the PEO			6,535,447

(a)Equity compensation grant date and year-end fair value for time-based awards were determined by the closing stock price on the date of grant or year-end, as applicable.

(b)Stock Award Adjustment in determining CAP is as follows (fair value of equity awards was determined using methodologies and assumptions developed in a manner materially consistent with those used to determine the grant date fair value of the awards):


Year	Year-end Fair Value of Equity Awards Granted in the Year which are Unvested	Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years that are Unvested	Fair Value as of Vesting Date of Equity Awards Granted and Vested in the Year	Year-over-Year Change in Fair Value of Equity Award Granted in Prior Years that Vested in the Year	Prior Year-end Fair Value of Equity Awards that Failed to Meet Vesting Conditions in the Year	Value of Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Fair Value or Total Compensation	Total Equity Award Adjustments
2023	4,164,244	—	—	—	—	—	4,164,244

Non-PEO NEO Average Total Compensation Amount

$ 1,835,172

Non-PEO NEO Average Compensation Actually Paid Amount

$ 2,665,370

Adjustment to Non-PEO NEO Compensation Footnote

To arrive at the Average CAP for our non-PEO named executive officers, total compensation as reported in the SCT was adjusted for the following:


			2023
Average of SCT Total Compensation for Non-PEO Named Executive Officers			1,835,172
less: Reported Value of Stock Awards in the SCT(a)			662,777
plus: Stock Award Adjustments(b)			1,510,942
less: Change in Actuarial Present Value of Defined Benefit and Pension Plans as Reported in the SCT			17,967
plus: Aggregate Service Cost and Prior Service Costs on Defined Benefit and Pension Plans			—
Average CAP for the Non-PEO Named Executive Officers			2,665,370

(a)Equity compensation grant date and year-end fair value for time-based awards were determined by the closing stock price on the date of grant or year-end, as applicable.

(b)Stock Award Adjustments in determining CAP


Year	Year-end Fair Value of Equity Awards Granted in the Year which are Unvested	Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years that are Unvested	Fair Value as of Vesting Date of Equity Awards Granted and Vested in the Year	Year-over-Year Change in Fair Value of Equity Award Granted in Prior Years that Vested in the Year	Prior Year-end Fair Value of Equity Awards that Failed to Meet Vesting Conditions in the Year	Value of Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Fair Value or Total Compensation	Total Equity Award Adjustments
2023	1,074,234	225,018	—	211,690	—	—	1,510,942

Compensation Actually Paid vs. Total Shareholder Return

CAP vs. Company TSR and Peer Group TSR

The following chart depicts the PEO and average non-PEO named executive officer CAP compared to the company’s TSR and peer group TSR for 2023.

Compensation Actually Paid vs. Net Income

CAP vs. Net Income

The following chart depicts the PEO and average non-PEO named executive officer CAP compared to the company’s Net Income for 2023.

Compensation Actually Paid vs. Company Selected Measure

CAP vs. Adjusted EBITDA

The following chart depicts the PEO and average non-PEO named executive officer CAP compared to the company’s Adjusted EBITDA for 2023.

Total Shareholder Return Vs Peer Group

CAP vs. Company TSR and Peer Group TSR

The following chart depicts the PEO and average non-PEO named executive officer CAP compared to the company’s TSR and peer group TSR for 2023.

Tabular List, Table


Performance Metrics Most Closely Linked to CAP for 2023
Net Income
Adjusted EBITDA

Total Shareholder Return Amount

$ 188.98

Peer Group Total Shareholder Return Amount

120.11

Net Income (Loss)

$ 182,872,000

Company Selected Measure Amount | $ / shares

432,421,000

PEO Name

Brian R. Gray

Additional 402(v) Disclosure

Represents Mr. Gray’s total compensation as shown in the Summary Compensation Table (SCT) for 2023.Represents the average total compensation of our non-PEO named executive officers as shown in the SCT for 2023Represents value of $100 invested in company stock on June 1, 2023 (the date we become a publicly traded company) assuming dividends are reinvested in company stock at the frequency paid.Net income for periods prior to the Separation is attributable to MDU Resources’ construction materials and contracting services segment.

Measure:: 1

Pay vs Performance Disclosure

Name

Net Income

Measure:: 2

Pay vs Performance Disclosure

Name

Adjusted EBITDA

Non-GAAP Measure Description

Adjusted EBITDA is a non-GAAP financial measure and is calculated by adding back income taxes; interest expense (net of interest income); depreciation, depletion and amortization expense; unrealized gains and losses on benefit plan investments; stock-based compensation; and one-time Separation costs to net income.

PEO | Equity Award Values Reported in the SCT [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

$ 2,620,279

PEO | Equity Award Adjustments [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

4,164,244

PEO | Changes to Pension Reported in SCT [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

PEO | Aggregated Service Cost and Prior Service Cost [Member]