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Long-Term Performance Share Bonus Plan - Additional Information (Detail) (USD $)
 12 Months Ended 0 Months Ended 3 Months Ended
Jan. 31, 2015
Employee
Feb. 01, 2014
Feb. 02, 2013
Nov. 07, 2014
Aug. 03, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Potential value of awards over the four-year period $ 19,400,000dxlg_DollarValueOfProjectedBenefitObligationAward        
Number of terminations 4dxlg_NumberOfEmployeesTerminated        
Additional stock compensation expense 200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost        
Stock compensation expense 2,996,000us-gaap_ShareBasedCompensation 1,893,000us-gaap_ShareBasedCompensation 777,000us-gaap_ShareBasedCompensation    
2016 Long Term Incentive Wrap Around Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Performance based compensation description If the Company’s stock price is $6.75, the 50% payout in restricted shares will be increased by 20% and if the stock price is $7.25 or higher, the 50% payout in restricted shares will be increased by 30%, with a pro-rata payout between $6.75 and $7.25.        
Stock compensation expense       8,700,000us-gaap_ShareBasedCompensation
/ us-gaap_PlanNameAxis
= dxlg_TwentyOneSixLongTermIncentiveWrapAroundPlanMember		  
Maximum | Employee Stock Plan, 2006 Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Net revenue targets 600,000,000dxlg_NetRevenueTargets
/ us-gaap_PlanNameAxis
= dxlg_EmployeeStockPlanTwentyZeroSixPlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		        
Percentage of operating margin 8.00%dxlg_OperatingMarginPercent
/ us-gaap_PlanNameAxis
= dxlg_EmployeeStockPlanTwentyZeroSixPlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		        
Payout percentage 100.00%dxlg_PayoutPercentage
/ us-gaap_PlanNameAxis
= dxlg_EmployeeStockPlanTwentyZeroSixPlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		        
Maximum | 2016 Long Term Incentive Wrap Around Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Payout percentage       100.00%dxlg_PayoutPercentage
/ us-gaap_PlanNameAxis
= dxlg_TwentyOneSixLongTermIncentiveWrapAroundPlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Closing stock price       $ 7.25us-gaap_SharePrice
/ us-gaap_PlanNameAxis
= dxlg_TwentyOneSixLongTermIncentiveWrapAroundPlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Projected benefit obligation percentage       30.00%dxlg_IncreaseInPayoutPercentage
/ us-gaap_PlanNameAxis
= dxlg_TwentyOneSixLongTermIncentiveWrapAroundPlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Pro-rata payout share price       $ 7.25dxlg_ProRataPayoutSharePrice
/ us-gaap_PlanNameAxis
= dxlg_TwentyOneSixLongTermIncentiveWrapAroundPlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Minimum | Employee Stock Plan, 2006 Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Net revenue targets 510,000,000dxlg_NetRevenueTargets
/ us-gaap_PlanNameAxis
= dxlg_EmployeeStockPlanTwentyZeroSixPlanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		        
Payout percentage 50.00%dxlg_PayoutPercentage
/ us-gaap_PlanNameAxis
= dxlg_EmployeeStockPlanTwentyZeroSixPlanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		        
Minimum | 2016 Long Term Incentive Wrap Around Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Payout percentage       80.00%dxlg_PayoutPercentage
/ us-gaap_PlanNameAxis
= dxlg_TwentyOneSixLongTermIncentiveWrapAroundPlanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Closing stock price       $ 6.75us-gaap_SharePrice
/ us-gaap_PlanNameAxis
= dxlg_TwentyOneSixLongTermIncentiveWrapAroundPlanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Projected benefit obligation percentage       20.00%dxlg_IncreaseInPayoutPercentage
/ us-gaap_PlanNameAxis
= dxlg_TwentyOneSixLongTermIncentiveWrapAroundPlanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Pro-rata payout share price       $ 6.75dxlg_ProRataPayoutSharePrice
/ us-gaap_PlanNameAxis
= dxlg_TwentyOneSixLongTermIncentiveWrapAroundPlanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Period 1          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Vesting plan 20.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_VestingAxis
= dxlg_PeriodOneMember		        
Period 2          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Vesting plan 40.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_VestingAxis
= dxlg_PeriodTwoMember		        
Period 3          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Vesting plan 40.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_VestingAxis
= dxlg_PeriodThreeMember		        
Restricted stocks          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Percentage of benefit obligation         50.00%dxlg_ProjectedBenefitObligationPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Restricted stocks | Employee Stock Plan, 2006 Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Restricted shares vested 352,848us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= dxlg_EmployeeStockPlanTwentyZeroSixPlanMember		        
Restricted stocks | 2016 Long Term Incentive Wrap Around Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Percentage of benefit obligation       50.00%dxlg_ProjectedBenefitObligationPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= dxlg_TwentyOneSixLongTermIncentiveWrapAroundPlanMember		  
Stock Options          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Percentage of benefit obligation         25.00%dxlg_ProjectedBenefitObligationPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Cash          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Percentage of benefit obligation         25.00%dxlg_ProjectedBenefitObligationPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_CashMember
Cash | 2016 Long Term Incentive Wrap Around Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Percentage of benefit obligation       50.00%dxlg_ProjectedBenefitObligationPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_CashMember
/ us-gaap_PlanNameAxis
= dxlg_TwentyOneSixLongTermIncentiveWrapAroundPlanMember		  
Time Based Vesting Schedule          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Percentage of benefit obligation 50.00%dxlg_ProjectedBenefitObligationPercentage
/ us-gaap_AwardTypeAxis
= dxlg_TimeBasedVestingScheduleMember		        
Potential value of awards over the four-year period 9,700,000dxlg_DollarValueOfProjectedBenefitObligationAward
/ us-gaap_AwardTypeAxis
= dxlg_TimeBasedVestingScheduleMember		        
Performance Based Vesting Schedule          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Percentage of benefit obligation 50.00%dxlg_ProjectedBenefitObligationPercentage
/ us-gaap_AwardTypeAxis
= dxlg_PerformanceBasedVestingScheduleMember		        
Potential value of awards over the four-year period 9,700,000dxlg_DollarValueOfProjectedBenefitObligationAward
/ us-gaap_AwardTypeAxis
= dxlg_PerformanceBasedVestingScheduleMember		        
Stock compensation expense 0us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= dxlg_PerformanceBasedVestingScheduleMember		        
Performance Based Vesting Schedule | Employee Stock Plan, 2006 Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Net revenue targets $ 550,000,000dxlg_NetRevenueTargets
/ us-gaap_AwardTypeAxis
= dxlg_PerformanceBasedVestingScheduleMember
/ us-gaap_PlanNameAxis
= dxlg_EmployeeStockPlanTwentyZeroSixPlanMember		        
Performance-Related Restricted Stock          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Restricted shares vested 20,850us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= dxlg_PerformanceBasedRestrictedStockMember		        
Performance Related Options          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Common Stock shares vested 25,382us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares
/ us-gaap_AwardTypeAxis
= dxlg_PerformanceRelatedOptionsMember		        
2016 Wrap-Around Plan | Maximum | 2016 Long Term Incentive Wrap Around Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Performance based compensation percentage       100.00%dxlg_TargetedCompensationPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= dxlg_TwentyOneSixLongTermIncentiveWrapAroundPlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
2016 Wrap-Around Plan | Minimum | 2016 Long Term Incentive Wrap Around Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Performance based compensation percentage       80.00%dxlg_TargetedCompensationPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= dxlg_TwentyOneSixLongTermIncentiveWrapAroundPlanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
2016 Wrap-Around Plan | Threshold | 2016 Long Term Incentive Wrap Around Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Performance based compensation percentage       50.00%dxlg_TargetedCompensationPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= dxlg_TwentyOneSixLongTermIncentiveWrapAroundPlanMember
/ us-gaap_RangeAxis
= dxlg_ThresholdMember		  
Chief Executive Officer          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Percentage of salary         100.00%dxlg_ShareBasedCompensationAwardAsPercentageOfBaseSalary
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
Senior Executive          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Percentage of salary         70.00%dxlg_ShareBasedCompensationAwardAsPercentageOfBaseSalary
/ us-gaap_TitleOfIndividualAxis
= dxlg_SeniorExecutiveMember
Other Participants          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Percentage of salary         50.00%dxlg_ShareBasedCompensationAwardAsPercentageOfBaseSalary
/ us-gaap_TitleOfIndividualAxis
= dxlg_OtherParticipantsMember