Quarterly report pursuant to Section 13 or 15(d)

Document And Entity Information

Document And Entity Information (USD $)
6 Months Ended
Jul. 30, 2011
Aug. 11, 2011
Jul. 30, 2010
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 Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 5,369,024,223
Entity Common Stock, Shares Outstanding   122,010,871  
Document Fiscal Year Focus 2011    
Document Fiscal Period Focus Q2    
Document Type 10-Q    
Amendment Flag false    
Document Period End Date Jul. 30, 2011