Subsequent Event - Aditional Information (Detail) (Subsequent Event, USD $) In Millions, unless otherwise specified	Nov. 10, 2014
Subsequent Event
Subsequent Event [Line Items]
Termination fee receivable	$ 2.5

Fee to be received by the company due to early termination of a lease agreement.

No definition available.

Name:	dxlg_TerminationFeeReceivable
Namespace Prefix:	dxlg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant