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Net Income per Share Net Income per Share (Additional Information) (Details)
 3 Months Ended 9 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Reconciliations of basic to diluted weighted-average common shares outstanding        
Weighted-average shares used in basic computation 34,537,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 34,541,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 34,598,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 34,496,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of stock-based awards 316,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements [1] 352,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements [1] 314,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements [1] 359,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements [1]
Weighted-average shares used for diluted computation 34,853,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 34,893,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 34,912,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 34,855,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Excluded NSUs        
Options excluded in the computation of diluted income per share        
Options excluded in the computation of diluted income per share (in shares) 140,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= deck_NonvestedStockUnitsMember		 [1] 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= deck_NonvestedStockUnitsMember		 [1]    
Excluded restricted stock units (RSUs)        
Options excluded in the computation of diluted income per share        
Options excluded in the computation of diluted income per share (in shares) 642,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockUnitsRSUMember		 [1] 795,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockUnitsRSUMember		 [1]    
Excluded stock appreciation rights (SARs)        
Options excluded in the computation of diluted income per share        
Options excluded in the computation of diluted income per share (in shares) 525,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockAppreciationRightsSARSMember		 [1] 525,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockAppreciationRightsSARSMember		 [1]    
[1] The share-based awards that were excluded from the dilutive effect were excluded because necessary conditions had not been satisfied for the shares to be issuable based on the Company’s performance through the three and nine months ended December 31, 2014 and 2013, respectively. The excluded awards include the maximum amounts achievable for these awards.