Annual report pursuant to Section 13 and 15(d)

Document And Entity Information

v3.7.0.1
Document And Entity Information - USD ($)
12 Months Ended
Jan. 28, 2017
Mar. 23, 2017
Jul. 29, 2016
Document and Entity Information [Text Block] [Abstract]      
Entity Registrant Name Dollar Tree Inc    
Entity Central Index Key 0000935703    
Current Fiscal Year End Date --01-28    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status No    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 21,781,519,553
Entity Common Stock, Shares Outstanding   236,297,936  
Document Fiscal Year Focus 2016    
Document Fiscal Period Focus FY    
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jan. 28, 2017