Document And Entity Information (USD $)	12 Months Ended
	Feb. 01, 2014	Mar. 05, 2014	Aug. 02, 2013
Document and Entity Information [Text Block] [Abstract]
Entity Registrant Name	Dollar Tree Inc
Entity Central Index Key	0000935703
Current Fiscal Year End Date	--02-01
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	No
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 11,637,937,009
Entity Common Stock, Shares Outstanding		206,224,996
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	false
Document Period End Date	Feb. 01, 2014