Income Tax Expense - Schedule of Tax Rate (Parentheticals) (Details)	6 Months Ended
Sep. 30, 2024
Schedule of Tax Rate [Abstract]
Lower domestic tax rate applicable to respective profits rate	16.50%

Domestic tax rate applicable to respective profits rate.

No definition available.

Name:	math_DomesticTaxRateApplicableToRespectiveProfitsRate
Namespace Prefix:	math_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	duration