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Commitments, Guarantees and Contingencies: (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2012
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Standby letters of credit |
Commitments, Guarantees and Contingencies |
Commitments and financial arrangements | $ 7.0
Letters of credit amount that enables qualification as self-insurer | 4.8
Letters of credit to support credit enhancement needs | 2.2
Performance and customs bonds |
Commitments, Guarantees and Contingencies |
Commitments and financial arrangements | 14.2
U.S. Customs Bonds | 13.0
Bonds related to transportation and other matters | 1.2
Benefit plan withdrawal obligations |
Commitments, Guarantees and Contingencies |
Multiemployer Plan Withdrawal Obligation | $ 91.3

X
- Definition 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 or letter of credit, if the Company fails to perform and the surety or lender has made payment to the obligee or beneficiary. + References No definition available. + Details
Name: | matx_ContingentObligationsMaximumExposure
Namespace Prefix: | matx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Letter of credit amount that enables the entity to qualify as a self-insurer for state and federal workers' compensation liabilities. + References No definition available. + Details
Name: | matx_LetterOfCreditAmountThatEnablesQualificationAsSelfInsurer
Namespace Prefix: | matx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the letter of credit amount to support various credit enhancement needs. + References No definition available. + Details
Name: | matx_LetterOfCreditAmountToSupportCreditEnhancementNeeds
Namespace Prefix: | matx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Performance guarantees made on transportation and other matters. + References No definition available. + Details
Name: | matx_TransportationAndOtherMattersGuarantees
Namespace Prefix: | matx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition 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. + References No definition available. + Details
Name: | matx_UsCustomsBonds
Namespace Prefix: | matx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition 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. + References No definition available. + Details
Name: | us-gaap_MultiemployerPlansWithdrawalObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant