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Discontinued Operations - Additional Disclosures (Details) (USD $)
9 Months Ended 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Jan. 23, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Disposal Group, Including Discontinued Operation, Consideration         $ 1,600,000us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Impairment of goodwill 2,283,000mrcy_DisposalGroupIncludingDiscontinuedOperationImpairmentofGoodwill        
Proceeds from Divestiture of Businesses 885,000us-gaap_ProceedsFromDivestitureOfBusinesses 0us-gaap_ProceedsFromDivestitureOfBusinesses      
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax 892,000us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax 0us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax      
MIS [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Impairment of goodwill 2,283,000mrcy_DisposalGroupIncludingDiscontinuedOperationImpairmentofGoodwill
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0mrcy_DisposalGroupIncludingDiscontinuedOperationImpairmentofGoodwill
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0mrcy_DisposalGroupIncludingDiscontinuedOperationImpairmentofGoodwill
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Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax $ 892,000us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= mrcy_MercuryIntelligenceSystemsBusinessUnitMember
$ 0us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= mrcy_MercuryIntelligenceSystemsBusinessUnitMember
$ 892,000us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= mrcy_MercuryIntelligenceSystemsBusinessUnitMember
$ 0us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= mrcy_MercuryIntelligenceSystemsBusinessUnitMember