Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity Outstanding Stock Options (Details)

v2.4.1.9
Shareholders' Equity Outstanding Stock Options (Details) (USD $)
3 Months Ended 12 Months Ended
Feb. 01, 2014
Jan. 31, 2015
Feb. 02, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock, shares authorized 100,000,000us-gaap_CommonStockSharesAuthorized 100,000,000us-gaap_CommonStockSharesAuthorized  
Granted, weighted average grant date fair value $ 3.96us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 3.92us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 1.03us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value $ 469,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue $ 6,099,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue $ 146,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
2011 Omnibus Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted, weighted average grant date fair value   $ 4.65us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= evlv_A2011OmnibusIncentivePlanMember
 
Options outstanding 3,083,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= evlv_A2011OmnibusIncentivePlanMember
2,463,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= evlv_A2011OmnibusIncentivePlanMember
 
Options outstanding, weighted average exercise price $ 4.03us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= evlv_A2011OmnibusIncentivePlanMember
$ 4.09us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= evlv_A2011OmnibusIncentivePlanMember
 
Options outstanding, weighted average remaining contractual term   8 years 1 month 6 days  
Options outstanding, aggregate intrinsic value   5,228,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_PlanNameAxis
= evlv_A2011OmnibusIncentivePlanMember
 
Vested or expected to vest, outstanding   2,424,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_PlanNameAxis
= evlv_A2011OmnibusIncentivePlanMember
 
Vested or expected to vest, outstanding, weighted average exercise price   $ 4.14us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= evlv_A2011OmnibusIncentivePlanMember
 
Vested or expected to vest, outstanding, weighted average remaining contractual term   8 years 0 months 27 days  
Vested or expected to vest, outstanding, aggregate intrinsic value   5,161,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue
/ us-gaap_PlanNameAxis
= evlv_A2011OmnibusIncentivePlanMember
 
2004 Omnibus Incentive Stock Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted, weighted average grant date fair value   $ 5.66us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= evlv_A2004OmnibusIncentiveStockPlanMember
 
Options outstanding 2,104,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= evlv_A2004OmnibusIncentiveStockPlanMember
1,206,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= evlv_A2004OmnibusIncentiveStockPlanMember
 
Options outstanding, weighted average exercise price $ 6.25us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= evlv_A2004OmnibusIncentiveStockPlanMember
$ 6.71us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= evlv_A2004OmnibusIncentiveStockPlanMember
 
Options outstanding, weighted average remaining contractual term   4 years 7 months 2 days  
Options outstanding, aggregate intrinsic value   493,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_PlanNameAxis
= evlv_A2004OmnibusIncentiveStockPlanMember
 
Vested or expected to vest, outstanding   1,203,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_PlanNameAxis
= evlv_A2004OmnibusIncentiveStockPlanMember
 
Vested or expected to vest, outstanding, weighted average exercise price   $ 6.67us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= evlv_A2004OmnibusIncentiveStockPlanMember
 
Vested or expected to vest, outstanding, weighted average remaining contractual term   4 years 6 months 28 days  
Vested or expected to vest, outstanding, aggregate intrinsic value   489,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue
/ us-gaap_PlanNameAxis
= evlv_A2004OmnibusIncentiveStockPlanMember
 
2001 Omnibus 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_A2001OmnibusStockPlanMember
 
Options outstanding 1,121,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= evlv_A2001OmnibusStockPlanMember
826,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= evlv_A2001OmnibusStockPlanMember
 
Options outstanding, weighted average exercise price $ 6.05us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= evlv_A2001OmnibusStockPlanMember
$ 6.89us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= evlv_A2001OmnibusStockPlanMember
 
Options outstanding, weighted average remaining contractual term   3 years 6 months 17 days  
Options outstanding, aggregate intrinsic value   518,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_PlanNameAxis
= evlv_A2001OmnibusStockPlanMember
 
Vested or expected to vest, outstanding   826,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_PlanNameAxis
= evlv_A2001OmnibusStockPlanMember
 
Vested or expected to vest, outstanding, weighted average exercise price   $ 6.89us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= evlv_A2001OmnibusStockPlanMember
 
Vested or expected to vest, outstanding, weighted average remaining contractual term   3 years 6 months 16 days  
Vested or expected to vest, outstanding, aggregate intrinsic value   518,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue
/ us-gaap_PlanNameAxis
= evlv_A2001OmnibusStockPlanMember
 
Stock Option [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
= us-gaap_StockOptionMember
 
Options outstanding 500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= us-gaap_StockOptionMember
450,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= us-gaap_StockOptionMember
 
Options outstanding, weighted average exercise price $ 4.24us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= us-gaap_StockOptionMember
$ 4.51us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= us-gaap_StockOptionMember
 
Options outstanding, weighted average remaining contractual term   5 years 4 months 9 days  
Options outstanding, aggregate intrinsic value   798,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_PlanNameAxis
= us-gaap_StockOptionMember
 
Vested or expected to vest, outstanding   443,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_PlanNameAxis
= us-gaap_StockOptionMember
 
Vested or expected to vest, outstanding, weighted average exercise price   $ 4.52us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= us-gaap_StockOptionMember
 
Vested or expected to vest, outstanding, weighted average remaining contractual term   5 years 4 months 10 days  
Vested or expected to vest, outstanding, aggregate intrinsic value   $ 782,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue
/ us-gaap_PlanNameAxis
= us-gaap_StockOptionMember