Shareholders' Equity Market Based Stock Option Awards (Details) (USD $)
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3 Months Ended |
12 Months Ended |
0 Months Ended |
Feb. 01, 2014
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Jan. 31, 2015
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Feb. 01, 2014
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Feb. 02, 2013
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Oct. 03, 2012
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Nov. 18, 2014
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Share-based compensation |
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$ 3,860,000us-gaap_ShareBasedCompensation
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$ 3,217,000us-gaap_ShareBasedCompensation
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$ 3,257,000us-gaap_ShareBasedCompensation
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Allocated Share-based Compensation Expense |
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2,537,000us-gaap_AllocatedShareBasedCompensationExpense
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2,405,000us-gaap_AllocatedShareBasedCompensationExpense
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1,682,000us-gaap_AllocatedShareBasedCompensationExpense
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Risk Free Interest Rate |
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1.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
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Granted, weighted average grant date fair value |
$ 3.96us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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$ 3.92us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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$ 1.03us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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Expected Term |
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6 years
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6 years
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6 years
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2011 Omnibus Incentive Plan [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Granted |
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232,000evlv_ShareBasedCompensationArrangementOptionsGrantsInPeriodGross / us-gaap_PlanNameAxis = evlv_A2011OmnibusIncentivePlanMember
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Options outstanding |
3,083,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = evlv_A2011OmnibusIncentivePlanMember
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2,463,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = evlv_A2011OmnibusIncentivePlanMember
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3,083,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = evlv_A2011OmnibusIncentivePlanMember
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Granted, weighted average grant date fair value |
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$ 4.65us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = evlv_A2011OmnibusIncentivePlanMember
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Number of consecutive trading days |
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20 days
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Market Based Stock Options Awards [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Granted |
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2,125,000evlv_ShareBasedCompensationArrangementOptionsGrantsInPeriodGross / us-gaap_PlanNameAxis = evlv_MarketBasedStockOptionsAwardsMember
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Stock Option Plans, Exercise Price Range, Lower Range Limit |
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6.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_PlanNameAxis = evlv_MarketBasedStockOptionsAwardsMember
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Risk Free Interest Rate |
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0.38%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_PlanNameAxis = evlv_MarketBasedStockOptionsAwardsMember
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Weighted average volatility rate |
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78.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate / us-gaap_PlanNameAxis = evlv_MarketBasedStockOptionsAwardsMember
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Options outstanding |
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1,715,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = evlv_MarketBasedStockOptionsAwardsMember
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Granted, weighted average grant date fair value |
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4.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = evlv_MarketBasedStockOptionsAwardsMember
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Number of tranches |
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3evlv_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNumberOfTranches / us-gaap_PlanNameAxis = evlv_MarketBasedStockOptionsAwardsMember
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Expected Term |
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3 years 3 months 18 days
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Grant date fair value |
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1,998,000evlv_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantDateFairValue / us-gaap_PlanNameAxis = evlv_MarketBasedStockOptionsAwardsMember
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Tranche 1 [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Award vesting rights |
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.5
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Granted, weighted average grant date fair value |
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0.93us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = evlv_Tranche1Member
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Expected Term |
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15 months
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Tranche 2 [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Award vesting rights |
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.25
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Stock Option Plans, Exercise Price Range, Lower Range Limit |
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8.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_PlanNameAxis = evlv_Tranche2Member
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Granted, weighted average grant date fair value |
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0.95us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = evlv_Tranche2Member
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Expected Term |
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20 months
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Tranche 3 [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Award vesting rights |
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.25
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Stock Option Plans, Exercise Price Range, Lower Range Limit |
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10.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_PlanNameAxis = evlv_Tranche3Member
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Granted, weighted average grant date fair value |
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0.95us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = evlv_Tranche3Member
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Expected Term |
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24 months
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Restricted Stock [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Share-based compensation |
$ 812,000us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
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$ 1,323,000us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
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$ 1,575,000us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
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Risk Free Interest Rate |
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0.32%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
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1.03%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
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Granted, weighted average grant date fair value |
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$ 4.91us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
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Expected Term |
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2 years 9 months 18 days
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Restricted Stock [Member] | Tranche 1 [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Granted, weighted average grant date fair value |
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1.48us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = evlv_Tranche1Member
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Expected Term |
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15 months
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Restricted Stock [Member] | Tranche 2 [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Granted, weighted average grant date fair value |
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1.39us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = evlv_Tranche2Member
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Expected Term |
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20 months
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Restricted Stock [Member] | Tranche 3 [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Granted, weighted average grant date fair value |
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1.31us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = evlv_Tranche3Member
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Expected Term |
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24 months
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