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LEASE - SALE AND LEASEBACK OF EQUIPMENT (Details) $ in Millions |  | 3 Months Ended
--- | --- | ---
Mar. 25, 2020 USD ($) | Mar. 31, 2021 item
Sale Leaseback Transaction [Line Items] |  |
Number of sale leaseback transactions | item |  | 0
Multiple Tranches of Chassis and Container Equipment |  |
Sale Leaseback Transaction [Line Items] |  |
Net proceeds | $ | $ 14.3 |
Base term | 5 years |

X
- Definition Number of sale leaseback transactions. + References No definition available. + Details
Name: | matx_NumberOfSaleLeasebackTransactions
Namespace Prefix: | matx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of cash inflow after closing and debt issuance costs received by a seller-lessee in a sale-leaseback transaction. + References No definition available. + Details
Name: | matx_SaleLeasebackTransactionNetProceeds
Namespace Prefix: | matx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseTermOfContract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SaleLeasebackTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SaleLeasebackTransactionDescriptionAxis=matx_MultipleTranchesOfChassisAndContainerEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |