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Components of Long Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2015
Feb. 01, 2014
Debt Instrument [Line Items]    
Total long-term debt $ 34,140us-gaap_LongTermDebt $ 16,706us-gaap_LongTermDebt
Current portion of long-term debt 7,489us-gaap_LongTermDebtCurrent 4,561us-gaap_LongTermDebtCurrent
Long-term debt, net of current portion 26,651us-gaap_LongTermDebtNoncurrent 12,145us-gaap_LongTermDebtNoncurrent
Equipment financing notes    
Debt Instrument [Line Items]    
Total long-term debt 19,390us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= dxlg_EquipmentFinancingNotesMember
16,706us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= dxlg_EquipmentFinancingNotesMember
Term loan, due 2019    
Debt Instrument [Line Items]    
Total long-term debt $ 14,750us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember