Name:	matx_ContingentObligationsMaximumExposure
Namespace Prefix:	matx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Letter of credit amount that enables the entity to qualify as a self-insurer for state and federal workers' compensation liabilities.

No definition available.

Name:	matx_LetterOfCreditAmountThatEnablesQualificationAsSelfInsurer
Namespace Prefix:	matx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the letter of credit amount to support various credit enhancement needs.

No definition available.

Name:	matx_LetterOfCreditAmountToSupportCreditEnhancementNeeds
Namespace Prefix:	matx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Performance guarantees made on transportation and other matters.

No definition available.

Name:	matx_TransportationAndOtherMattersGuarantees
Namespace Prefix:	matx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Maximum potential amount of future payments (undiscounted) the Company could be required to make to a surety or lender, from whom the Company obtained a bond letter of credit, if the Company fails to perform and the surety or lender has made payment to the obligee or beneficiary.

No definition available.

Name:	matx_UsCustomsBonds
Namespace Prefix:	matx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount of the obligation recognized by withdrawing from a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

No definition available.