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Income Taxes - Additional Information (Detail) (USD $)
0 Months Ended 3 Months Ended 12 Months Ended
Feb. 01, 2014
Feb. 01, 2014
Jan. 31, 2015
Feb. 01, 2014
Feb. 02, 2013
Income Taxes [Line Items]          
Change in valuation allowance $ 51,300,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount $ 51,300,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount      
Federal net operating loss carry forwards expiration period minimum       2022  
Federal net operating loss carry forwards expiration period maximum       2034  
Alternative minimum tax credits carryforwards 2,292,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 2,292,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 2,292,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 2,292,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax  
Liability for unrecognized tax benefits     3,100,000us-gaap_UnrecognizedTaxBenefits    
Income taxes paid     100,000us-gaap_IncomeTaxesPaid 200,000us-gaap_IncomeTaxesPaid 500,000us-gaap_IncomeTaxesPaid
Federal          
Income Taxes [Line Items]          
Net operating loss carryforwards     130,500,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_InternalRevenueServiceIRSMember
   
State and Local Jurisdiction          
Income Taxes [Line Items]          
Net operating loss carryforwards     68,300,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
   
Hong Kong          
Income Taxes [Line Items]          
Net operating loss carryforwards     100,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= country_HK
   
Canada          
Income Taxes [Line Items]          
Net operating loss carryforwards     2,400,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= country_CA
   
Domestic Tax Authority          
Income Taxes [Line Items]          
Net operating loss carryforwards, expiration year     2034    
Net operating loss carryforwards, stock compensation deductions     $ 13,300,000dxlg_NetOperatingLossCarryforwardExcessTaxDeductionRelatedToStockBasedCompensation
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember