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Discontinued Operations - Additional Disclosures (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Impairment of goodwill $ 2,283mrcy_DisposalGroupIncludingDiscontinuedOperationImpairmentofGoodwill $ 0mrcy_DisposalGroupIncludingDiscontinuedOperationImpairmentofGoodwill $ 2,283mrcy_DisposalGroupIncludingDiscontinuedOperationImpairmentofGoodwill $ 0mrcy_DisposalGroupIncludingDiscontinuedOperationImpairmentofGoodwill