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CAPITAL CONSTRUCTION FUND - Summary of the activities within the CCF Assigned receivables account (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023
CAPITAL CONSTRUCTION FUND |  |
CCF assigned accounts receivable balance at beginning of period | $ 218.1 | $ 9.9
Assigned accounts receivable |  | 200.0
Repurchase of assigned accounts receivable | (35.8) |
Interest earned on assigned accounts receivable | 3.6 | 0.1
CCF assigned accounts receivable balance at end of period | $ 185.9 | $ 210.0

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 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

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