Quarterly report pursuant to Section 13 or 15(d)

Document And Entity Information

Document And Entity Information (USD $)
9 Months Ended
Oct. 27, 2012
Nov. 09, 2012
Jul. 29, 2011
Entity Registrant Name Dollar Tree Inc    
Entity Central Index Key 0000935703    
Current Fiscal Year End Date --02-02    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status No    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 7,748,097,313
Entity Common Stock, Shares Outstanding   227,206,335  
Document Fiscal Year Focus 2012    
Document Fiscal Period Focus Q3    
Document Type 10-Q    
Amendment Flag false    
Document Period End Date Oct. 27, 2012