Schedule of future estimated annual cash payments information related to multiemployer plans in which the employer participates. A multiemployer plan is 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.

Name:	matx_FutureEstimatedAnnualCashPaymentsToMultiEmployerPensionPlanTableTextBlock
Namespace Prefix:	matx_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration