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Operating Segment, Geographic Information and Significant Customers - Programs Comprising Ten Percent or more of Company's Revenue (Detail) (Sales Revenue, Net [Member])
 3 Months Ended 6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]        
Concentration risk, percentage 39.00%us-gaap_ConcentrationRiskPercentage1 28.00%us-gaap_ConcentrationRiskPercentage1 52.00%us-gaap_ConcentrationRiskPercentage1 16.00%us-gaap_ConcentrationRiskPercentage1
Patriot Program [Member] | Program Concentration Risk [Member]        
Segment Reporting Information [Line Items]        
Concentration risk, percentage 18.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= mrcy_ProgramConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= mrcy_PatriotProgramMember		   18.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= mrcy_ProgramConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= mrcy_PatriotProgramMember		  
SEWIP Program [Member] | Program Concentration Risk [Member]        
Segment Reporting Information [Line Items]        
Concentration risk, percentage     13.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= mrcy_ProgramConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= mrcy_SEWIPProgramMember		  
F-35 Program [Member] | Program Concentration Risk [Member]        
Segment Reporting Information [Line Items]        
Concentration risk, percentage 11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= mrcy_ProgramConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= mrcy_F35ProgramMember		   11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= mrcy_ProgramConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= mrcy_F35ProgramMember		  
Aegis Program [Member] | Program Concentration Risk [Member]        
Segment Reporting Information [Line Items]        
Concentration risk, percentage 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= mrcy_ProgramConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= mrcy_AegisProgramMember		 28.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= mrcy_ProgramConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= mrcy_AegisProgramMember		 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= mrcy_ProgramConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= mrcy_AegisProgramMember		 16.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= mrcy_ProgramConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= mrcy_AegisProgramMember