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Accrued Severance Benefits - Future Benefits Payments to Employees (Detail) $ in Thousands	Sep. 30, 2025 USD ($)
Postemployment Benefits [Abstract]
2026	$ 94
2027	539
2028	106
2029	2,216
2030	2,643
2031 – 2036	$ 17,339

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

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

- 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

- References

No definition available.

+ Details

Name:	us-gaap_PostemploymentBenefitsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration