Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $) In Thousands	12 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2009
Consolidated Statements Of Comprehensive Income
Unrealized losses on long-term investments, tax (benefit)	$ (500)	$ 83	$ (392)

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mcrs_TemporaryAndNonCreditOtherThanTemporaryLossesOnLongTermInvestmentsTax

Namespace Prefix:

mcrs

Data Type:

xbrli:monetaryItemType

Balance Type:

debit

Period Type:

duration