Annual report pursuant to Section 13 and 15(d)

Document And Entity Information

v3.19.1
Document And Entity Information - USD ($)
12 Months Ended
Feb. 02, 2019
Mar. 25, 2019
Aug. 03, 2018
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 Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 21,167,164,088
Entity Common Stock, Shares Outstanding   238,204,351  
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Document Type 10-K    
Amendment Flag false    
Entity Emerging Growth Company false    
Entity Small Business false    
Entity Shell Company false    
Document Period End Date Feb. 02, 2019