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CAPITAL CONSTRUCTION FUND (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 USD ($) item | Dec. 31, 2023 USD ($)
Maximum period to commit fund deposits for qualified purposes | 25 years |
Period over which deposits will be treated as non-qualified withdrawals | 5 years |
Number of vessels under agreements for construction | item | 3 |
Repurchase of assigned accounts receivable | $ 53.8 |
Assigned accounts receivables |  | $ 200.0
Eligible Accounts Receivable Assigned to CCF |  |
Weighted average life of securities held within the fund | 96 days |
Assigned accounts receivables | $ 178.1 | $ 218.1

X
- Definition The amount of assgined accounts receivables to capital construction fund. + References No definition available. + Details
Name: | matx_AssignedAccountsReceivables
Namespace Prefix: | matx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the maximum period from the date of deposit to commit deposits for qualified purposes. + References No definition available. + Details
Name: | matx_MaximumPeriodToCommitFundDepositsForQualifiedPurposes
Namespace Prefix: | matx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of vessels under agreements for construction. + References No definition available. + Details
Name: | matx_NumberOfVesselsUnderAgreementForConstruction
Namespace Prefix: | matx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The period over which deposits not committed for qualified purposes longer than the maximum specified period from the date of deposit will be treated as non-qualified withdrawals. + References No definition available. + Details
Name: | matx_PeriodOverWhichDepositsWillBeTreatedAsNonQualifiedWithdrawals
Namespace Prefix: | matx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of repurchase of assigned accounts receivables to capital construction fund + References No definition available. + Details
Name: | matx_RepurchaseOfAssignedAccountsReceivable
Namespace Prefix: | matx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Weighted average life of securities held within the fund, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | matx_SecuritiesHeldInFundWeightedAverageLife
Namespace Prefix: | matx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=us-gaap_TradeAccountsReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |