Segments and Disaggregated Revenue - Information For Segments and Corporate and Support (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 29, 2022	Oct. 30, 2021	Oct. 29, 2022	Oct. 30, 2021	Jan. 29, 2022
Condensed Consolidated Income Statement Data:
Net sales	$ 6,936.6	$ 6,415.4	$ 20,602.0	$ 19,232.4
Gross profit	2,071.5	1,763.7	6,536.4	5,588.8
Operating income	381.3	310.5	1,618.2	1,232.6
Interest expense, net	32.7	33.4	97.3	99.4
Other expense, net	0.2	0.2	0.3	0.2
Income before income taxes	348.4	276.9	1,520.6	1,133.0
Condensed Consolidated Balance Sheet Data:
Consolidated Goodwill	1,982.4	1,985.3	1,982.4	1,985.3	$ 1,984.4
Consolidated Total assets	22,909.5	21,390.0	22,909.5	21,390.0	21,721.8
Corporate, support and Other
Condensed Consolidated Income Statement Data:
Operating income	(100.0)	(68.6)	(322.6)	(242.9)
Condensed Consolidated Balance Sheet Data:
Consolidated Total assets	493.2	565.5	493.2	565.5	491.6
Dollar Tree
Condensed Consolidated Income Statement Data:
Net sales	3,756.1	3,417.4	11,109.0	10,003.0
Dollar Tree | Operating segments
Condensed Consolidated Income Statement Data:
Net sales	3,756.1	3,417.4	11,109.0	10,003.0
Gross profit	1,328.3	1,031.1	4,197.9	3,207.1
Operating income	499.7	290.5	1,814.7	1,019.2
Condensed Consolidated Balance Sheet Data:
Consolidated Goodwill	422.9	425.8	422.9	425.8	424.9
Consolidated Total assets	9,785.2	8,954.7	9,785.2	8,954.7	9,358.4
Family Dollar
Condensed Consolidated Income Statement Data:
Net sales	3,180.5	2,998.0	9,493.0	9,229.4
Family Dollar | Operating segments
Condensed Consolidated Income Statement Data:
Net sales	3,180.5	2,998.0	9,493.0	9,229.4
Gross profit	743.2	732.6	2,338.5	2,381.7
Operating income	(18.4)	88.6	126.1	456.3
Condensed Consolidated Balance Sheet Data:
Consolidated Goodwill	1,559.5	1,559.5	1,559.5	1,559.5	1,559.5
Consolidated Total assets	$ 12,631.1	$ 11,869.8	$ 12,631.1	$ 11,869.8	$ 11,871.8