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Narrative (Details) (USD $)
3 Months Ended 0 Months Ended
May 02, 2015
May 03, 2014
Oct. 03, 2012
Nov. 18, 2014
Jun. 19, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense $ 261,000us-gaap_AllocatedShareBasedCompensationExpense $ 744,000us-gaap_AllocatedShareBasedCompensationExpense      
Document Period End Date May 02, 2015        
Number of Omnibus Stock Plans 1evlv_NumberOfOmnibusStockPlans        
Award Vesting Period 3 years        
Granted, weighted average grant date fair value $ 4.35us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 4.02us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value 1,397,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue      
Unrecognized compensation cost related to non-vested awards 2,544,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized        
Period for recognition of unrecognized compensation cost 2 years 3 months 8 days        
Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Purchase price of common stock, percent 100.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
       
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years        
Award Vesting Period 3 years        
2011 Omnibus Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized 6,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= evlv_A2011OmnibusIncentivePlanMember
       
Granted, weighted average grant date fair value $ 6.10us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= evlv_A2011OmnibusIncentivePlanMember
       
Share-based Compensation Arrangement, Options, Grants in Period, Gross 270,000evlv_ShareBasedCompensationArrangementOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= evlv_A2011OmnibusIncentivePlanMember
       
Market Based Stock Options Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted, weighted average grant date fair value     $ 4.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= evlv_MarketBasedStockOptionsAwardsMember
   
Share-based Compensation Arrangement, Options, Grants in Period, Gross     2,125,000evlv_ShareBasedCompensationArrangementOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= evlv_MarketBasedStockOptionsAwardsMember
   
2004 Omnibus Incentive Stock Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted, weighted average grant date fair value $ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= evlv_A2004OmnibusIncentiveStockPlanMember
       
Share-based Compensation Arrangement, Options, Grants in Period, Gross 0evlv_ShareBasedCompensationArrangementOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= evlv_A2004OmnibusIncentiveStockPlanMember
       
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award Vesting Period       3 years 12 months
Granted, weighted average grant date fair value       $ 4.91us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Unrecognized compensation cost related to non-vested awards $ 3,223,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember