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Segmented information - Narrative (Details)	12 Months Ended
	Dec. 31, 2023 segment
Operating Segments [Abstract]
Number of operating segments	1

X

- Definition

Number of Segments, Operating

+ References

No definition available.

+ Details

Name:	mx_NumberOfSegmentsOperating
Namespace Prefix:	mx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Operating Segments [Abstract]

+ References

No definition available.

+ Details

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