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Accrued Severance Benefits - Future Benefits Payments to Employees (Detail) $ in Thousands	Jun. 30, 2022 USD ($)
Postemployment Benefits [Abstract]
Remainder of 2022	$ 237
2023	590
2024	864
2025	1,409
2026	1,973
2027	1,635
2028 – 2032	$ 18,987

X

- Definition

Post Employment Benefit Payments Five Fiscal Years Thereafter.

+ References

No definition available.

+ Details

Name:	mx_PostEmploymentBenefitPaymentsFiveFiscalYearsThereafter
Namespace Prefix:	mx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Post employment benefit payments next twelve months.

+ References

No definition available.

+ Details

Name:	mx_PostEmploymentBenefitPaymentsNextTwelveMonths
Namespace Prefix:	mx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Post employment benefit payments year two.

+ References

No definition available.

+ Details

Name:	mx_PostEmploymentBenefitPaymentsYearTwo
Namespace Prefix:	mx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Postemployment benefit payments remainder of fiscal year.

+ References

No definition available.

+ Details

Name:	mx_PostemploymentBenefitPaymentsRemainderOfFiscalYear
Namespace Prefix:	mx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Postemployment benefit payments year five.

+ References

No definition available.

+ Details

Name:	mx_PostemploymentBenefitPaymentsYearFive
Namespace Prefix:	mx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Postemployment benefit payments year four.

+ References

No definition available.

+ Details

Name:	mx_PostemploymentBenefitPaymentsYearFour
Namespace Prefix:	mx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Postemployment benefit payments year three.

+ References

No definition available.

+ Details

Name:	mx_PostemploymentBenefitPaymentsYearThree
Namespace Prefix:	mx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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Period Type:	duration