Quarterly report pursuant to Section 13 or 15(d)

Document And Entity Information

Document And Entity Information
6 Months Ended
Aug. 02, 2014
Aug. 15, 2014
Document and Entity Information [Text Block] [Abstract]    
Entity Registrant Name Dollar Tree Inc  
Entity Central Index Key 0000935703  
Current Fiscal Year End Date --01-31  
Entity Well-known Seasoned Issuer Yes  
Entity Voluntary Filers No  
Entity Current Reporting Status No  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   205,625,625
Document Fiscal Year Focus 2014  
Document Fiscal Period Focus Q2  
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Aug. 02, 2014