Debt - Components of Long Term Debt (Parenthetical) (Details) (USD $) In Millions, unless otherwise specified	Jan. 31, 2015
Debt Disclosure [Abstract]
Reclassification of debt issuance costs	$ 0.1
Prepaid and other assets	$ 0.5

Reclassification of debt issuance costs from prepaid and other current assets .

No definition available.

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