GENERAL AND SIGNIFICANT ACCOUNTING POLICIES - DEFERRED INCOME TAXES (Details) $ in Millions	Sep. 30, 2022 USD ($)
GENERAL AND SIGNIFICANT ACCOUNTING POLICIES
Capital construction fund	$ 565.0

The balance of cash on deposit in capital construction fund.

No definition available.

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