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CAPITAL CONSTRUCTION FUND - Summary of the activities within the CCF Assigned Accounts Receivable account (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2024
CAPITAL CONSTRUCTION FUND |  |
Cash and cash equivalents, and investments account | $ 599.4 | $ 642.6
Assigned accounts receivables | $ 200.0 |

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
- References No definition available. + Details
Name: | matx_CapitalConstructionFundAbstract
Namespace Prefix: | matx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The carrying value of cash and cash equivalents and investments in capital construction fund. + References No definition available. + Details
Name: | matx_CapitalConstructionFundCashAndCashEquivalentsAndInvestments
Namespace Prefix: | matx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant