Annual report pursuant to Section 13 and 15(d)

Document And Entity Information

v2.4.0.6
Document And Entity Information (USD $)
12 Months Ended
Feb. 02, 2013
Mar. 06, 2013
Jul. 27, 2012
Document and Entity Information [Text Block] [Abstract]      
Entity Registrant Name Dollar Tree Inc    
Entity Central Index Key 0000935703    
Current Fiscal Year End Date --02-02    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status No    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 11,507,786,430
Entity Common Stock, Shares Outstanding   224,590,879  
Document Fiscal Year Focus 2012    
Document Fiscal Period Focus FY    
Document Type 10-K    
Amendment Flag false    
Document Period End Date Feb. 02, 2013