Cover [Abstract] Document Type Document Annual Report Document Transition Report Document Period End Date Entity File Number Entity Registrant Name Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Address, Address Line One Entity Address, City or Town Entity Address, State or Province Entity Address, Postal Zip Code City Area Code Local Phone Number Title of 12(b) Security Trading Symbol Security Exchange Name Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Small Business Entity Emerging Growth Company ICFR Auditor Attestation Flag Document Financial Statement Error Correction [Flag] Entity Shell Company Entity Common Stock, Shares Outstanding Entity Public Float Entity Central Index Key Current Fiscal Year End Date Document Fiscal Year Focus Document Fiscal Period Focus Amendment Flag Auditor Name Auditor Location Auditor Firm ID CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME Statement [Table] Product and Service [Axis] Product and Service [Domain] This member represents revenue earned primarily through the carriage of containerized freight between various US Pacific Coast, Hawaii, Guam, Micronesia, China and other Pacific island ports. Ocean. Transportation. Ocean Transportation This element represents revenue from rail intermodal, highway brokerage and warehousing. Logistics. Logistics Statement [Line Items] Statement Revenues [Abstract] Operating Revenue: Revenue from Contract with Customer, Excluding Assessed Tax Total Operating Revenue Total Costs and Expenses [Abstract] Costs and Expenses: Operating Expenses: Operating Costs and Expenses Operating costs Income (Loss) from Equity Method Investments Loss (Income) from SSAT Loss (Income) from SSAT Company's Share of SSAT's Net Income (Loss) (Loss) Income from SSAT General and Administrative Expense General and administrative General and administrative Costs and Expenses Total Costs and Expenses Total Costs and Expenses Operating Income (Loss) Operating Income Total Operating Income Investment Income, Interest Interest income Interest Expense, Nonoperating Interest expense Other Nonoperating Income (Expense) Other income (expense), net Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Income before Taxes Income Tax Expense (Benefit) Income taxes Total income taxes Net Income Net income Other Comprehensive Income (Loss), Net of Tax [Abstract] Other Comprehensive Income (Loss), Net of Income Taxes: Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract] Other Comprehensive Income (Loss): Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax Net change in pension and post-retirement liabilities Total recognized in other comprehensive (income) loss Other Comprehensive Income, Other, Net of Tax Other adjustments Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other comprehensive income (loss), net of tax Total Other Comprehensive Income (Loss), Net of Income Taxes Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive Income Earnings Per Share, Basic Net income, Basic (in dollars per share) Basic Earnings Per Share (in dollars per share) Earnings Per Share, Diluted Net income, Diluted (in dollars per share) Diluted Earnings Per Share (in dollars per share) Earnings Per Share, Basic, Other Disclosures [Abstract] Weighted Average Number of Shares Outstanding: Weighted Average Number of Shares Outstanding, Basic Basic (in shares) Weighted Average Number of Shares Outstanding, Diluted Diluted (in shares) Diluted (in shares) CONSOLIDATED BALANCE SHEETS Assets [Abstract] ASSETS Assets, Current [Abstract] Current Assets: Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Cash and Cash Equivalents Receivables, Net, Current Accounts receivable, net of allowance for credit losses of $9.8 million and $9.9 million, respectively Prepaid Expense and Other Assets, Current Prepaid expenses and other assets Total Assets, Current Current assets Total current assets Assets, Noncurrent [Abstract] Long-term Assets: Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Investment in SSAT Investment in SSAT Property, Plant and Equipment, Net Property and equipment, net Total Property and Equipment, net Operating Lease, Right-of-Use Asset Operating lease right of use assets Goodwill Total Goodwill Intangible Assets, Net (Excluding Goodwill) Intangible assets, net Total Intangible Assets, net The carrying value of cash and cash equivalents and investments in capital construction fund. Capital Construction Fund, Cash And Cash Equivalents And Investments Cash and cash equivalents, and investments account Capital Construction Fund Deferred Costs, Noncurrent Deferred dry-docking costs, net Other Assets, Noncurrent Other long-term assets Total Assets, Noncurrent Non-current assets Total long-term assets Assets Total Assets Liabilities and Equity [Abstract] LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities, Current [Abstract] Current Liabilities: Short-term Debt Current portion of debt Accounts Payable and Accrued Liabilities, Current Accounts payable and accruals Operating Lease, Liability, Current Less: Short-term portion Operating lease liabilities Accrued Liabilities and Other Liabilities Total Other liabilities Liabilities, Current Current liabilities Total current liabilities Liabilities, Noncurrent [Abstract] Long-term Liabilities: Long-term Debt, Excluding Current Maturities Long-term debt, net of deferred loan fees Operating Lease, Liability, Noncurrent Long-term operating lease liabilities Long-term operating lease liabilities Deferred Income Tax Liabilities, Net Deferred income taxes Other Liabilities, Noncurrent Other long-term liabilities Total Liabilities, Noncurrent Non-current liabilities Total long-term liabilities Commitments and Contingencies. Commitments and Contingencies (see Note 17) Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Shareholders' Equity: Common Stock, Value, Issued Common stock - common stock without par value; authorized, 150 million shares ($0.75 stated value per share): outstanding, 33.0 million shares in 2024 and 34.4 million shares in 2023 Additional Paid in Capital, Common Stock Additional paid in capital Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive loss, net Retained Earnings (Accumulated Deficit) Retained earnings Stockholders' Equity Attributable to Parent Balance at the end of the period Balance at the beginning of the period Total shareholders' equity Liabilities and Equity Total Liabilities and Shareholders' Equity Allowance for Doubtful Accounts Receivable Balance at End of Year Balance at Beginning of year Accounts receivable, allowance for credit loss Common Stock, Shares Authorized Common stock, shares authorized Common Stock, Par or Stated Value Per Share Common stock, stated value (in dollars per share) Common Stock, Shares, Outstanding Balance (in shares) Balance (in shares) Common stock, shares outstanding CONSOLIDATED STATEMENTS OF CASH FLOWS Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Cash Flows From Operating Activities: Income (Loss) from Continuing Operations Attributable to Parent Net income Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Reconciling adjustments: The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets, excluding the amortization of operation lease right-of-use assets. Depreciation, Depletion and Amortization, Excluding Lease Amortization Depreciation and amortization Operating Lease, Right-of-Use Asset, Amortization Expense Amortization of operating lease right of use assets Deferred Income Taxes and Tax Credits Deferred income taxes Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property (Gain) Loss on disposal of property and equipment Share-based Compensation. Share-based compensation expense Proceeds from joint venture. Proceeds from Joint Venture Distributions from SSAT Other Operating Activities, Cash Flow Statement Other Increase (Decrease) in Operating Capital [Abstract] Changes in assets and liabilities: Increase (Decrease) in Accounts and Notes Receivable Accounts receivable, net Represents the increase (decrease) during the reporting period in the value of dry-docking payments made during the current reporting period for benefits that will be received over a period of years. Increase (Decrease) in Deferred Dry Docking Payments Deferred dry-docking payments Represents the increase (decrease) during the reporting period in the value of dry-docking amortization during the current reporting period for benefits that will be received over a period of years. Increase (Decrease) in Deferred Dry Docking Amortization Deferred dry-docking amortization Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other assets Increase (Decrease) in Accounts Payable Accounts payable, accruals and other liabilities The increase (decrease) in operating lease liabilities. Increase (Decrease) in Operating Lease Liabilities Operating lease assets and liabilities, net Increase (Decrease) in Other Noncurrent Liabilities Other long-term liabilities Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Cash Flows From Investing Activities: Payments for Construction in Process Capitalized vessel construction expenditures Payments to Acquire Other Productive Assets Capital expenditures (excluding vessel construction expenditures) Proceeds from Sale of Productive Assets Proceeds from disposal of property and equipment, net Payments to Acquire Intangible Assets Payments for asset acquisitions Amount of cash outflow associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities. Increased In Restricted Cash Cash and interest deposits into Capital Construction Fund Amount of cash inflow associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities. Decreased In Restricted Cash Withdrawals from Capital Construction Fund Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Cash Flows From Financing Activities: Repayments of Debt Repayments of debt Payments of Ordinary Dividends, Common Stock Dividends paid Payments for Repurchase of Common Stock Repurchase of Matson common stock Payments Related to Tax Withholding for Share-based Compensation Tax withholding related to net share settlements of restricted stock units Net Cash Provided by (Used in) Financing Activities Net cash used in financing activities Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, Cash Equivalents and Restricted Cash, End of the Year Cash, Cash Equivalents and Restricted Cash, Beginning of the Year Total Cash, Cash Equivalents and Restricted Cash, End of the Year Restricted Cash and Cash Equivalents [Abstract] Reconciliation of Cash, Cash Equivalents, and Restricted Cash, at End of the Year: Restricted Cash and Cash Equivalents Restricted Cash Supplemental Cash Flow Information [Abstract] Supplemental Cash Flow Information: Interest Paid, Net Interest paid, net of capitalized interest Income Taxes Paid, Net Income tax paid, net of income tax refunds Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Non-cash Information: Capital Expenditures Incurred but Not yet Paid Capital expenditures included in accounts payable, accruals and other liabilities Noncash or Part Noncash Acquisition, Value of Assets Acquired Non-cash payments for intangible asset acquisitions CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY Equity Components [Axis] Equity Component [Domain] Common Stock Additional Paid In Capital AOCI Attributable to Parent [Member] Accumulated Other Comprehensive Income (Loss) Retained Earnings Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Shareholders' Equity Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Share-based compensation Stock Issued During Period, Value, New Issues Shares issued, net of shares withheld for employee taxes Stock Issued During Period, Shares, New Issues Shares issued, net of shares withheld for employee taxes (in shares) Stock Repurchased and Retired During Period, Value Share repurchase Stock Repurchased and Retired During Period, Shares Share repurchase (in shares) Increase in retained earnings due to acquisition by investee of subsidiary. Equity Method Investment, Increase Due to Subsidiary Acquisition Equity interest in SSAT (see Note 4) Dividends, Common Stock, Cash Dividends Common Stock, Dividends, Per Share, Cash Paid Dividends (in dollars per share) DESCRIPTION OF THE BUSINESS Business Description and Basis of Presentation [Text Block] DESCRIPTION OF THE BUSINESS SIGNIFICANT ACCOUNTING POLICIES Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] SIGNIFICANT ACCOUNTING POLICIES REPORTABLE SEGMENTS Segment Reporting Disclosure [Text Block] REPORTABLE SEGMENTS INVESTMENT IN SSAT Equity Method Investments and Joint Ventures Disclosure [Text Block] INVESTMENT IN SSAT PROPERTY AND EQUIPMENT Property, Plant and Equipment Disclosure [Text Block] PROPERTY AND EQUIPMENT GOODWILL AND INTANGIBLES Goodwill and Intangible Assets Disclosure [Text Block] GOODWILL AND INTANGIBLES CAPITAL CONSTRUCTION FUND Restricted Assets Disclosure [Text Block] CAPITAL CONSTRUCTION FUND DEBT Debt Disclosure [Text Block] DEBT LEASES Lessee, Operating Leases [Text Block] LEASES INCOME TAXES Income Taxes: Income Tax Disclosure [Text Block] INCOME TAXES PENSION AND POST-RETIREMENT PLANS Pension and Other Postretirement Benefits Disclosure [Text Block] PENSION AND POST-RETIREMENT PLANS MULTI-EMPLOYER WITHDRAWAL LIABILITIES