- Definition

Period of time of collective bargaining agreement, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	matx_CollectiveBargainingAgreementTerm
Namespace Prefix:	matx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of misdemeanor counts of violations of Section 407 of the Rivers and Harbors Act of 1899, "Refuse Act", accepted by the entity.

+ References

No definition available.

+ Details

Name:	matx_NumberOfCountsOfViolatingRefuseActAccepted
Namespace Prefix:	matx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of seaports.

+ References

No definition available.

+ Details

Name:	matx_NumberOfPorts
Namespace Prefix:	matx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of subpoenas received from the Hawaii Attorney General by the entity.

+ References

No definition available.

+ Details

Name:	matx_NumberOfSubpoenasReceived
Namespace Prefix:	matx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the amount of the penalty for violations of Section 407 of the Rivers and Harbors Act of 1899, "Refuse Act".

+ References

No definition available.

+ Details

Name:	matx_PenaltyPayment
Namespace Prefix:	matx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the amount of the penalty for violations of Section 407 of the Rivers and Harbors Act of 1899, "Refuse Act" in the form of a community service payment.

+ References

No definition available.

+ Details

Name:	matx_PenaltyPaymentCommunityServicePayments
Namespace Prefix:	matx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the amount of the penalty for violations of Section 407 of the Rivers and Harbors Act of 1899, "Refuse Act" in the form of a fine.

+ References

No definition available.

+ Details

Name:	matx_PenaltyPaymentFine
Namespace Prefix:	matx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

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

- Details

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

CONTINGENCIES (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended
	Feb. 20, 2015	Feb. 20, 2015 item	Jan. 29, 2015 item	Apr. 30, 2014 item
Employee Matters
Term of collective bargaining agreement	5 years
Number of ports		29matx_NumberOfPorts
Environmental Matters
Number of subpoenas received from the Hawaii Attorney General				2matx_NumberOfSubpoenasReceived
Number of counts of violating the refuse act accepted			2
Penalty payment			$ 1.0matx_PenaltyPayment
Penalty payment in the form of a fine			0.4matx_PenaltyPaymentFine
Penalty payment in the form of a community restitution payment			$ 0.6