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CAPITAL CONSTRUCTION FUND - Summary of the activities within the CCF Assigned receivables account (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
CAPITAL CONSTRUCTION FUND |  |
CCF assigned receivables balance at beginning of period | $ 218.1 | $ 9.9
Assigned account receivables |  | 200.0
Interest earned on assigned receivables | 3.2 |
CCF assigned receivables balance at end of period | $ 221.3 | $ 209.9

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 amount of assigned receivables of capital construction fund. + References No definition available. + Details
Name: | matx_CapitalConstructionFundAssignedReceivables
Namespace Prefix: | matx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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