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Represents the number of dry-docking inspections to be made within a specified period.

No definition available.

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Represents the period within which number of specified dry-docking inspections to be made.

No definition available.

Name:	matx_PeriodWithinWhichSpecifiedDryDockingInspectionsToBeMade
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Amount of interest capitalized during the period.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 835
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483013/835-20-50-1

Name:	us-gaap_InterestCostsCapitalized
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Data Type:	xbrli:monetaryItemType
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- References

No definition available.

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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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

No definition available.

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Name:	srt_RangeAxis=srt_MaximumMember
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Data Type:	na
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Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=matx_TerminalCranesMember
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Data Type:	na
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Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=matx_ContainersAndChassisMember
Namespace Prefix:
Data Type:	na
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