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Fair Value Measurements (Narrative) (Details) (USD $)
9 Months Ended
Dec. 31, 2014
Sep. 30, 2012
Contingent Consideration Arrangement    
Reconciliation of beginning and ending amounts related to the fair value for contingent consideration for acquisition of business, categorized as Level 3    
Balance at the beginning of the period $ 30,000,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= deck_ContingentConsiderationArrangementMember
 
Payments (500,000)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
/ us-gaap_FairValueByLiabilityClassAxis
= deck_ContingentConsiderationArrangementMember
 
Change in fair value (1,800,000)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_FairValueByLiabilityClassAxis
= deck_ContingentConsiderationArrangementMember
 
Balance at the end of the period 27,700,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= deck_ContingentConsiderationArrangementMember
 
Sanuk | Contingent Consideration Arrangement    
Contingent consideration    
Compound annual growth rate (CAGR) (as a percent) 14.90%deck_BusinessCombinationContingentConsiderationArrangementsCompoundAnnualGrowthRate
/ us-gaap_BusinessAcquisitionAxis
= deck_SanukMember
/ us-gaap_FairValueByLiabilityClassAxis
= deck_ContingentConsiderationArrangementMember
 
Gross profit range 71,000,000deck_BusinessCombinationContingentConsiderationArrangementsRangeOfGrossProfit
/ us-gaap_BusinessAcquisitionAxis
= deck_SanukMember
/ us-gaap_FairValueByLiabilityClassAxis
= deck_ContingentConsiderationArrangementMember
 
Discount rate (as percent) 7.00%deck_BusinessCombinationContingentConsiderationArrangementsDiscountRate
/ us-gaap_BusinessAcquisitionAxis
= deck_SanukMember
/ us-gaap_FairValueByLiabilityClassAxis
= deck_ContingentConsiderationArrangementMember
 
Percentage point change to compound annual growth rate 5.00%deck_BusinessCombinationContingentConsiderationArrangementsPercentagePointChangeInTheCompoundAnnualGrowthRate
/ us-gaap_BusinessAcquisitionAxis
= deck_SanukMember
/ us-gaap_FairValueByLiabilityClassAxis
= deck_ContingentConsiderationArrangementMember
 
Effect of a five-percentage-point change to total liability 2,000,000deck_BusinessCombinationContingentConsiderationArrangementsEffectOfFivePercentagePointChangeInTheCompoundAnnualGrowthRateOnTheTotalLiability
/ us-gaap_BusinessAcquisitionAxis
= deck_SanukMember
/ us-gaap_FairValueByLiabilityClassAxis
= deck_ContingentConsiderationArrangementMember
 
Hoka    
Contingent consideration    
Maximum contingent consideration payments   2,000,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= deck_HokaMember
Hoka | Contingent Consideration Arrangement    
Contingent consideration    
Maximum contingent consideration payments   $ 2,000,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= deck_HokaMember
/ us-gaap_FairValueByLiabilityClassAxis
= deck_ContingentConsiderationArrangementMember