Dollar Tree, Inc. Quarterly report pursuant to Section 13 or 15(d)

LONG-TERM DEBT (Narrative) (Details)	Apr. 29, 2017	Dec. 31, 2015	Mar. 09, 2015 USD ($)	Feb. 23, 2015 USD ($)
Senior Notes \| 5.25% Acquisition Notes, due 2020
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 750,000,000.0
Debt Instrument, Interest Rate, Stated Percentage	5.25%			5.25%
Senior Notes \| 5.75% Acquisition Notes, due 2023
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 2,500,000,000.0
Debt Instrument, Interest Rate, Stated Percentage	5.75%			5.75%
Line of Credit \| Senior Secured Credit Facilities \| Revolving Credit Facility
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 1,250,000,000.00
Debt Covenant, Maximum Ratio for Ability to Pay Dividends \| Senior Notes \| Acquisition Notes
Debt Instrument [Line Items]
Consolidated total net leverage ratio		3.50
Debt Covenant, Maximum Ratio for Ability to Pay Dividends \| Line of Credit \| Senior Secured Credit Facilities
Debt Instrument [Line Items]
Consolidated total net leverage ratio		3.50
Debt Covenant, In Compliance, Less Than Maximum Ratio for Ability to Pay Dividends \| Senior Notes \| Acquisition Notes
Debt Instrument [Line Items]
Consolidated total net leverage ratio	3.50
Debt Covenant, In Compliance, Less Than Maximum Ratio for Ability to Pay Dividends \| Line of Credit \| Senior Secured Credit Facilities
Debt Instrument [Line Items]
Consolidated total net leverage ratio	3.50