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

Represents the weighted average period of the tranches of unsecured long-term debt in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

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

Maximum number of additional units that may be acquired, in connection with an unconditional purchase obligation that has not been recognized for financial reporting purposes.

No definition available.

Name:	matx_UnrecordedUnconditionalPurchaseObligationAdditionalQuantityMaximum
Namespace Prefix:	matx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents the percentage of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the fourth and fifth fiscal year following the latest fiscal year.

No definition available.

Name:	matx_UnrecordedUnconditionalPurchaseObligationPercentagePaymentDueOnFourthAndFifthAnniversary
Namespace Prefix:	matx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Represents the percentage of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the second and third fiscal year following the latest fiscal year.

No definition available.

Name:	matx_UnrecordedUnconditionalPurchaseObligationPercentagePaymentDueOnSecondAndThirdAnniversary
Namespace Prefix:	matx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Represents the percentage of fixed and determinable portion of the unrecorded unconditional purchase obligation due upon execution of the ship building agreement.

No definition available.

Name:	matx_UnrecordedUnconditionalPurchaseObligationPercentagePaymentDueUponExecutionOfAgreement
Namespace Prefix:	matx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Represents the period over which the purchase price of unconditional purchase obligation will be paid.

No definition available.

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

Amount of the total principal payments made during the annual reporting period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Name:	us-gaap_DebtInstrumentAnnualPrincipalPayment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Increase of additional borrowings on existing and new debt instruments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph f

-Article 4

Name:	us-gaap_DebtInstrumentIncreaseAdditionalBorrowings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Interest rate stated in the contractual debt agreement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

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

The minimum number of units that must be purchased, in connection with an unconditional purchase obligation that has not been recognized for financial reporting purposes.

No definition available.

Name:	us-gaap_UnrecordedUnconditionalPurchaseObligationMinimumQuantityRequired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

The amount purchased during the period under an unrecorded unconditional purchase obligation (for example, under the take-or-pay or throughput contract).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 440

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 47

-Paragraph 7

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.