Annual report pursuant to Section 13 and 15(d)

Document And Entity Information

v2.4.1.9
Document And Entity Information (USD $)
12 Months Ended
Jan. 31, 2015
Mar. 04, 2015
Aug. 01, 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 Public Float     $ 10,784,848,842dei_EntityPublicFloat
Entity Common Stock, Shares Outstanding   205,759,864dei_EntityCommonStockSharesOutstanding  
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY    
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jan. 31, 2015