Annual report pursuant to Section 13 and 15(d)

Document And Entity Information

v3.3.1.900
Document And Entity Information - USD ($)
12 Months Ended
Jan. 30, 2016
Mar. 23, 2016
Jul. 31, 2015
Document and Entity Information [Text Block] [Abstract]      
Entity Registrant Name Dollar Tree Inc    
Entity Central Index Key 0000935703    
Current Fiscal Year End Date --01-30    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status No    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 10,784,848,842
Entity Common Stock, Shares Outstanding   205,759,864  
Document Fiscal Year Focus 2015    
Document Fiscal Period Focus FY    
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jan. 30, 2016