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
Jan. 28, 2012
Mar. 07, 2012
Jul. 29, 2011
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     $ 7,748,097,313
Entity Common Stock, Shares Outstanding   115,652,758  
Document Fiscal Year Focus 2011    
Document Fiscal Period Focus FY    
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jan. 28, 2012