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Fair Value Measurements (Details) (USD $)
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3 Months Ended |
12 Months Ended |
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Mar. 31, 2015
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2012
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Dec. 31, 2014
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Earn-out obligations - current |
$ 14,565,000vsec_CurrentPortionOfEarnOutObligationFairValueDisclosure
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$ 9,455,000vsec_CurrentPortionOfEarnOutObligationFairValueDisclosure
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| Earn-out obligation - long-term |
30,200,000vsec_EarnOutObligationsFairValueDisclosure
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0vsec_EarnOutObligationsFairValueDisclosure
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| Income tax expense benefit on interest rate swap |
189,000vsec_IncomeTaxExpenseBenefitOnInterestRateSwap
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| Earn-out obligation |
35,000,000vsec_PaymentOfEarnOutObligation
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| Discount rate (in hundredths) |
4.50%us-gaap_FairValueInputsDiscountRate
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| WBI Acquisition [Member] |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Earn-out obligations - current |
9,800,000vsec_CurrentPortionOfEarnOutObligationFairValueDisclosure
/ us-gaap_BusinessAcquisitionAxis
= vsec_WbiAcquisitionMember
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| Maximum potential cash payment |
40,000,000vsec_MaximumPotentialCashPayment
/ us-gaap_BusinessAcquisitionAxis
= vsec_WbiAcquisitionMember
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| Post acquisition payment period |
4 years
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| Earn-out obligation |
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2,700,000vsec_PaymentOfEarnOutObligation
/ us-gaap_BusinessAcquisitionAxis
= vsec_WbiAcquisitionMember
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219,000vsec_PaymentOfEarnOutObligation
/ us-gaap_BusinessAcquisitionAxis
= vsec_WbiAcquisitionMember
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7,100,000vsec_PaymentOfEarnOutObligation
/ us-gaap_BusinessAcquisitionAxis
= vsec_WbiAcquisitionMember
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| Earn-out Obligation - Current [Member] |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Earn-out obligation |
4,800,000vsec_PaymentOfEarnOutObligation
/ us-gaap_FairValueByLiabilityClassAxis
= vsec_CurrentPortionOfEarnOutObligationsMember
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| Earn-out Obligation - Long-term [Member] |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Earn-out obligation |
30,200,000vsec_PaymentOfEarnOutObligation
/ us-gaap_FairValueByLiabilityClassAxis
= vsec_EarnOutObligationsMember
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| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Assets [Member] |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Non-COLI assets held in DSC plan |
263,000vsec_MutualFundsHeldInDscPlanFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_OtherAssetsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
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253,000vsec_MutualFundsHeldInDscPlanFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_OtherAssetsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
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| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Accrued Expenses [Member] |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Interest rate swaps |
490,000vsec_InterestRateSwaps
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByLiabilityClassAxis
= vsec_AccruedExpensesMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
|
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0vsec_InterestRateSwaps
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByLiabilityClassAxis
= vsec_AccruedExpensesMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
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| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Earn-out Obligation - Current [Member] |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Earn-out obligations - current |
14,565,000vsec_CurrentPortionOfEarnOutObligationFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= vsec_CurrentPortionOfEarnOutObligationsMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
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9,455,000vsec_CurrentPortionOfEarnOutObligationFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= vsec_CurrentPortionOfEarnOutObligationsMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
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| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Earn-out Obligation - Long-term [Member] |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Earn-out obligation - long-term |
$ 30,200,000vsec_EarnOutObligationsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= vsec_EarnOutObligationsMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
|
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$ 0vsec_EarnOutObligationsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= vsec_EarnOutObligationsMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
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