Summary of Significant Accounting Policies (Details) $ in Millions	3 Months Ended	12 Months Ended					72 Months Ended
	Feb. 03, 2024 USD ($) store state	Feb. 03, 2024 USD ($) segment store state	Jan. 28, 2023 USD ($)	Jan. 29, 2022 USD ($)	Feb. 01, 2020 USD ($)	Feb. 02, 2019 USD ($)	Feb. 03, 2024 USD ($) store state	Jan. 30, 2021 USD ($)
Property, Plant and Equipment [Line Items]
Number of retail discount stores | store	16,700	16,700					16,700
Number of states/provinces the Company operates in | state	48	48					48
Number of reporting business segments | segment		2
Money market securities valued at cost, in cash and cash equivalents	$ 304.2	$ 304.2	$ 317.2				$ 304.2
Warehousing and distribution costs capitalized into inventory	299.8	299.8	298.6				299.8
Interest costs capitalized		5.9	3.8	$ 1.1
Self-insurance liability	363.5	363.5	318.2				363.5
Self-insurance, restricted cash balances	72.3	72.3	68.5				72.3
Operating lease right-of-use assets	6,488.3	6,488.3	6,458.0				6,488.3
Operating lease liabilities	6,960.6	6,960.6					6,960.6
Stockholders' equity	(7,313.1)	(7,313.1)	(8,751.5)	(7,718.5)			(7,313.1)	$ (7,285.3)
Impairment charge for certain store assets		511.5	39.9	4.4
Operating lease, impairment loss		358.7	$ 20.1	$ 3.9
Asset impaiment		$ 14.0
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]		Selling, General and Administrative Expense, Including Impairment Charges	Selling, General and Administrative Expense, Including Impairment Charges	Selling, General and Administrative Expense, Including Impairment Charges
Advertising costs		$ 109.6	$ 99.5	$ 93.9
Stock-based compensation expense		96.7	110.4	79.9
Goodwill impairment	1,069.0	1,069.0	0.0	0.0
Impairments, excluding goodwill		1,461.5	40.0	4.4
Trade Names
Property, Plant and Equipment [Line Items]
Impairments, excluding goodwill	950.0
Store Portfolio Optimization Review
Property, Plant and Equipment [Line Items]
Impairment charge for certain store assets		152.2
Operating lease, impairment loss		351.7
Asset impaiment		$ 503.9
Family Dollar
Property, Plant and Equipment [Line Items]
Goodwill impairment	$ 1,069.0				$ 313.0	$ 2,727.0	$ 4,109.0
Buildings | Minimum
Property, Plant and Equipment [Line Items]
Useful life (in years)	39 years	39 years					39 years
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Useful life (in years)	40 years	40 years					40 years
Building Improvements
Property, Plant and Equipment [Line Items]
Useful life (in years)	20 years	20 years					20 years
Furniture, fixtures and equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful life (in years)	3 years	3 years					3 years
Furniture, fixtures and equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful life (in years)	15 years	15 years					15 years
Dollar Tree
Property, Plant and Equipment [Line Items]
Goodwill impairment		$ 0.0
Family Dollar
Property, Plant and Equipment [Line Items]
Goodwill impairment		1,069.0
Retained Earnings
Property, Plant and Equipment [Line Items]
Stockholders' equity	$ (7,124.6)	$ (7,124.6)	$ (8,123.0)	$ (6,507.6)			$ (7,124.6)	$ (5,179.7)