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COMPARATIVE FIGURES	12 Months Ended
	Dec. 31, 2012
COMPARATIVE FIGURES	24. COMPARATIVE FIGURES Certain of the comparative figures have been reclassified to conform to the current year’s method of presentation.

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- Definition

Comparative figures.

+ References

No definition available.

+ Details

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Namespace Prefix:	mga_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration