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Post Employment Benefit Plans (Details) (USD $)
3 Months Ended
Mar. 27, 2015
plan
Mar. 29, 2014
Compensation and Retirement Disclosure [Abstract]    
Defined contribution savings plan, number of plans 1vec_DefinedContributionPlanNumberofPlans  
Defined contribution savings plan, portion of matching contributions charged to income $ 500,000us-gaap_DefinedContributionPlanCostRecognized $ 1,000,000us-gaap_DefinedContributionPlanCostRecognized
Excess Savings Plan    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Maximum allowed employee contributions 0vec_PostemploymentBenefitsMaximumAnnualContributionsPerEmployeeAmount
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= vec_ExcessSavingsPlanMember
 
Period following employee separation date when benefits will be paid 7 months  
Vested percentage 100.00%vec_PostemploymentBenefitsVestedPercentage
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= vec_ExcessSavingsPlanMember
 
Contributions accrued by the Company $ 200,000us-gaap_PostemploymentBenefitsLiabilityCurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= vec_ExcessSavingsPlanMember