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Market Based Stock Option Awards (Details) (USD $)
3 Months Ended 12 Months Ended 0 Months Ended
May 02, 2015
May 03, 2014
Jan. 31, 2015
Oct. 03, 2012
Nov. 18, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation $ 609,000us-gaap_ShareBasedCompensation $ 1,044,000us-gaap_ShareBasedCompensation      
Allocated Share-based Compensation Expense 261,000us-gaap_AllocatedShareBasedCompensationExpense 744,000us-gaap_AllocatedShareBasedCompensationExpense      
Granted, weighted average grant date fair value $ 4.35us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 4.02us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue      
Expected Term 6 years   5 years    
2011 Omnibus Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted 270,000evlv_ShareBasedCompensationArrangementOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= evlv_A2011OmnibusIncentivePlanMember
       
Options outstanding 2,171,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= evlv_A2011OmnibusIncentivePlanMember
  2,463,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= evlv_A2011OmnibusIncentivePlanMember
   
Granted, weighted average grant date fair value $ 6.10us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= evlv_A2011OmnibusIncentivePlanMember
       
Number of consecutive trading days       20 days  
Market Based Stock Options Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted       2,125,000evlv_ShareBasedCompensationArrangementOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= evlv_MarketBasedStockOptionsAwardsMember
 
Stock Option Plans, Exercise Price Range, Lower Range Limit       6.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_PlanNameAxis
= evlv_MarketBasedStockOptionsAwardsMember
 
Risk Free Interest Rate       0.38%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_PlanNameAxis
= evlv_MarketBasedStockOptionsAwardsMember
 
Weighted average volatility rate       78.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate
/ us-gaap_PlanNameAxis
= evlv_MarketBasedStockOptionsAwardsMember
 
Options outstanding 977,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= evlv_MarketBasedStockOptionsAwardsMember
       
Granted, weighted average grant date fair value       4.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= evlv_MarketBasedStockOptionsAwardsMember
 
Number of tranches       3evlv_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNumberOfTranches
/ us-gaap_PlanNameAxis
= evlv_MarketBasedStockOptionsAwardsMember
 
Expected Term       3 years 3 months 18 days  
Grant date fair value       1,998,000evlv_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantDateFairValue
/ us-gaap_PlanNameAxis
= evlv_MarketBasedStockOptionsAwardsMember
 
Tranche 1 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights       .5  
Granted, weighted average grant date fair value       0.93us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= evlv_Tranche1Member
 
Expected Term       15 months  
Tranche 2 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights       .25  
Stock Option Plans, Exercise Price Range, Lower Range Limit       8.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_PlanNameAxis
= evlv_Tranche2Member
 
Granted, weighted average grant date fair value       0.95us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= evlv_Tranche2Member
 
Expected Term       20 months  
Tranche 3 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights       .25  
Stock Option Plans, Exercise Price Range, Lower Range Limit       10.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_PlanNameAxis
= evlv_Tranche3Member
 
Granted, weighted average grant date fair value       0.95us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= evlv_Tranche3Member
 
Expected Term       24 months  
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation $ 348,000us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
$ 300,000us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Risk Free Interest Rate         1.03%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Granted, weighted average grant date fair value         $ 4.91us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember