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CAPITAL CONSTRUCTION FUND - Summary of the activities within the CCF Assigned Accounts Receivable account (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023
CAPITAL CONSTRUCTION FUND |  |
CCF assigned accounts receivable balance at beginning of period | $ 218.1 | $ 9.9
Assigned accounts receivable |  | 200.0
Interest earned on assigned accounts receivable | 10.2 | 3.3
CCF assigned accounts receivable balance at end of period | $ 228.3 | $ 213.2

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