Goodwill and Nonamortizing Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Feb. 03, 2024	Feb. 03, 2024	Jan. 28, 2023	Jan. 29, 2022
Goodwill [Roll Forward]
Goodwill beginning balance		$ 1,983.1	$ 1,984.4
Foreign currency translation adjustments		(0.3)	(1.3)
Goodwill impairment	$ (1,069.0)	(1,069.0)	0.0	$ 0.0
Goodwill ending balance	913.8	913.8	1,983.1	1,984.4
Dollar Tree
Goodwill [Roll Forward]
Goodwill beginning balance		423.6	424.9
Foreign currency translation adjustments		(0.3)	(1.3)
Goodwill impairment		0.0
Goodwill ending balance	423.3	423.3	423.6	424.9
Family Dollar
Goodwill [Roll Forward]
Goodwill beginning balance		1,559.5	1,559.5
Foreign currency translation adjustments		0.0	0.0
Goodwill impairment		(1,069.0)
Goodwill ending balance	$ 490.5	$ 490.5	$ 1,559.5	$ 1,559.5