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Potential Common Stock Equivalents Excluded From Computation of Diluted Earning Per Share (Detail) (USD $)
12 Months Ended
Jan. 31, 2015
Feb. 01, 2014
Feb. 02, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti dilutive shares 497,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 443,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount  
Stock options      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti dilutive shares 1,545,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockOptionMember
2,088,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockOptionMember
1,634,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockOptionMember
Range of exercise prices of such options, minimum $ 4.96dxlg_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareExercisePriceRangeLowerLimit
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockOptionMember
$ 4.96dxlg_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareExercisePriceRangeLowerLimit
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockOptionMember
$ 3.76dxlg_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareExercisePriceRangeLowerLimit
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockOptionMember
Range of exercise prices of such options, maximum $ 7.52dxlg_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareExercisePriceRangeUpperLimit
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockOptionMember
$ 10.26dxlg_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareExercisePriceRangeUpperLimit
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockOptionMember
$ 10.26dxlg_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareExercisePriceRangeUpperLimit
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockOptionMember