Legal Proceedings (Details)	12 Months Ended
Dec. 31, 2018 plantiff
Pending litigation \| Private Attorney General Act Lawsuit Against Dollar Tree Stores, Inc. and Dollar Tree Distribution, Inc. \| Dollar Tree
Loss Contingencies [Line Items]
Loss contingency, number of plaintiffs	2

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration