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Expenses by Reportable Segment for Restructuring Plans (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Dec. 31, 2014
Restructuring Reserve [Roll Forward]  
Restructuring liability at beginning of period $ 2,143us-gaap_RestructuringReserveCurrent
Cash paid (1,922)us-gaap_PaymentsForRestructuring
Reversals (98)mrcy_RestructuringExpenseReversal [1]
Restructuring liability at end of period 2,651us-gaap_RestructuringReserveCurrent
Severance & Related [Member]  
Restructuring Reserve [Roll Forward]  
Restructuring liability at beginning of period 1,371us-gaap_RestructuringReserveCurrent
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
Cash paid (1,365)us-gaap_PaymentsForRestructuring
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
Reversals (98)mrcy_RestructuringExpenseReversal
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
[1]
Restructuring liability at end of period 938us-gaap_RestructuringReserveCurrent
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
Facility & Other [Member]  
Restructuring Reserve [Roll Forward]  
Restructuring liability at beginning of period 772us-gaap_RestructuringReserveCurrent
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
Cash paid (557)us-gaap_PaymentsForRestructuring
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
Reversals 0mrcy_RestructuringExpenseReversal
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
Restructuring liability at end of period 1,713us-gaap_RestructuringReserveCurrent
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
MCE  
Restructuring Reserve [Roll Forward]  
Restructuring, Settlement and Impairment Provisions 2,495us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= mrcy_MercuryCommercialElectronicsMember
MCE | Severance & Related [Member]  
Restructuring Reserve [Roll Forward]  
Restructuring, Settlement and Impairment Provisions 997us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= mrcy_MercuryCommercialElectronicsMember
MCE | Facility & Other [Member]  
Restructuring Reserve [Roll Forward]  
Restructuring, Settlement and Impairment Provisions 1,498us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
/ us-gaap_StatementBusinessSegmentsAxis
= mrcy_MercuryCommercialElectronicsMember
MDS  
Restructuring Reserve [Roll Forward]  
Restructuring, Settlement and Impairment Provisions 33us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= mrcy_MercuryDefenseSystemsMember
MDS | Severance & Related [Member]  
Restructuring Reserve [Roll Forward]  
Restructuring, Settlement and Impairment Provisions 33us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= mrcy_MercuryDefenseSystemsMember
MDS | Facility & Other [Member]  
Restructuring Reserve [Roll Forward]  
Restructuring, Settlement and Impairment Provisions $ 0us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
/ us-gaap_StatementBusinessSegmentsAxis
= mrcy_MercuryDefenseSystemsMember
[1] Reversals result from unused outplacement services.