XML 73 R64.htm IDEA: XBRL DOCUMENT v3.25.3

Derivative Financial Instruments - Cash deposits (Detail) - Zero Cost Collar And Forward Contracts [Member] - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Deposit Assets [Line Items]
Deposit with counterparty	$ 0	$ 1,000
SC [Member]
Deposit Assets [Line Items]
Deposit with counterparty	$ 0	$ 1,000

X

- Definition

Deposit assets [LineItems].

+ References

No definition available.

+ Details

Name:	mx_DepositAssetsLineItems
Namespace Prefix:	mx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of cash or securities placed with a broker or counterparty as security for a trading or derivatives securities position which was partially obtained with funds provided by the broker dealer.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(17))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478795/946-210-50-6

+ Details

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

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=mx_ZeroCostCollarAndForwardContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CounterpartyNameAxis=mx_StandardCharteredBankKoreaLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: