Dollar Tree, Inc. Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Details)

Summary of Significant Accounting Policies (Details)	3 Months Ended								12 Months Ended
Summary of Significant Accounting Policies (Details)	Jan. 30, 2021 USD ($) province store state $ / shares	Oct. 31, 2020 store $ / shares	Aug. 01, 2020 store $ / shares	May 02, 2020 store $ / shares	Feb. 01, 2020 USD ($) store $ / shares	Nov. 02, 2019 store $ / shares	Aug. 03, 2019 store $ / shares	May 04, 2019 store $ / shares	Jan. 30, 2021 USD ($) distribution_center province store state segment $ / shares	Feb. 01, 2020 USD ($) store $ / shares	Feb. 02, 2019 USD ($) $ / shares	Feb. 03, 2018 USD ($)
Property, Plant and Equipment [Line Items]
Number of retail discount stores \| store	15,685	15,606	15,479	15,370	15,288	15,262	15,115	15,264	15,685	15,288
Number of states/provinces the Company operates in \| state	48								48
Number of reporting business segments \| segment									2
Money market securities valued at cost, in cash and cash equivalents	$ 1,135,000,000.0				$ 287,600,000				$ 1,135,000,000.0	$ 287,600,000
Warehousing and distribution costs capitalized into inventory	$ 172,700,000				$ 169,700,000				172,700,000	169,700,000
Interest Costs Capitalized									3,200,000	2,400,000	$ 4,200,000
Amortization expense, net									48,100,000
Amortization expense, net										52,900,000	65,400,000
Impairment charge for certain store assets									4,600,000	9,100,000	13,000,000.0
Operating lease, impairment loss									3,800,000	8,500,000
Advertising costs									80,800,000	102,900,000	99,900,000
Stock-based compensation expense									$ 83,900,000	$ 61,400,000	$ 63,300,000
Diluted net income (loss) per share (usd per share) \| $ / shares	$ 2.13	$ 1.39	$ 1.10	$ 1.04	$ 0.52	$ 1.08	$ 0.76	$ 1.12	$ 5.65	$ 3.47	$ (6.69)
Operating lease right-of-use assets	$ 6,324,100,000				$ 6,225,000,000.0				$ 6,324,100,000	$ 6,225,000,000.0	$ 6,200,000,000
Operating lease liabilities	6,413,700,000								6,413,700,000		6,100,000,000
Stockholders' equity	$ (7,285,300,000)				(6,254,800,000)				$ (7,285,300,000)	(6,254,800,000)	(5,642,900,000)	$ (7,182,300,000)
Cumulative Effect, Period of Adoption, Adjustment
Property, Plant and Equipment [Line Items]
Stockholders' equity											65,300,000
Software Development
Property, Plant and Equipment [Line Items]
Useful life (in years)									3 years
Buildings \| Minimum
Property, Plant and Equipment [Line Items]
Useful life (in years)									39 years
Buildings \| Maximum
Property, Plant and Equipment [Line Items]
Useful life (in years)									40 years
Furniture, fixtures and equipment \| Minimum
Property, Plant and Equipment [Line Items]
Useful life (in years)									3 years
Furniture, fixtures and equipment \| Maximum
Property, Plant and Equipment [Line Items]
Useful life (in years)									15 years
Dollar Tree
Property, Plant and Equipment [Line Items]
Merchandise fixed price									$ 1.00
Family Dollar
Property, Plant and Equipment [Line Items]
Number of distribution centers \| distribution_center									11
United States \| Dollar Tree
Property, Plant and Equipment [Line Items]
Number of distribution centers \| distribution_center									15
Canada
Property, Plant and Equipment [Line Items]
Number of states/provinces the Company operates in \| province	5								5
Canada \| Dollar Tree
Property, Plant and Equipment [Line Items]
Number of distribution centers \| distribution_center									2
Retained Earnings
Property, Plant and Equipment [Line Items]
Stockholders' equity	$ (5,179,700,000)				$ (3,837,800,000)				$ (5,179,700,000)	$ (3,837,800,000)	(3,076,100,000)	$ (4,666,900,000)
Retained Earnings \| Cumulative Effect, Period of Adoption, Adjustment
Property, Plant and Equipment [Line Items]
Stockholders' equity											$ 65,300,000