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Capitalization (Details)	6 Months Ended
Capitalization (Details)	Nov. 30, 2012 item
Capitalization
Number of votes per share	1

Represents the number of votes per share, which ordinary shareholders of the Company are entitled to receive.

No definition available.

Name:	mg_CommonStockNumberOfVotesPerShare
Namespace Prefix:	mg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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