Segments and Disaggregated Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	May 04, 2024	Apr. 29, 2023
Disaggregation of Revenue [Line Items]
Net sales	$ 7,626.4	$ 7,319.5
Dollar Tree
Disaggregation of Revenue [Line Items]
Net sales	4,165.6	3,931.7
Family Dollar
Disaggregation of Revenue [Line Items]
Net sales	$ 3,460.8	$ 3,387.8
Product Concentration Risk | Revenue, Segment Benchmark | Dollar Tree
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	100.00%	100.00%
Product Concentration Risk | Revenue, Segment Benchmark | Family Dollar
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	100.00%	100.00%
Consumable | Dollar Tree
Disaggregation of Revenue [Line Items]
Net sales	$ 2,092.0	$ 1,887.2
Consumable | Family Dollar
Disaggregation of Revenue [Line Items]
Net sales	$ 2,794.7	$ 2,713.5
Consumable | Product Concentration Risk | Revenue, Segment Benchmark | Dollar Tree
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	50.20%	48.00%
Consumable | Product Concentration Risk | Revenue, Segment Benchmark | Family Dollar
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	80.80%	80.10%
Variety | Dollar Tree
Disaggregation of Revenue [Line Items]
Net sales	$ 1,908.0	$ 1,863.6
Variety | Product Concentration Risk | Revenue, Segment Benchmark | Dollar Tree
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	45.80%	47.40%
Seasonal | Dollar Tree
Disaggregation of Revenue [Line Items]
Net sales	$ 165.6	$ 180.9
Seasonal | Product Concentration Risk | Revenue, Segment Benchmark | Dollar Tree
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	4.00%	4.60%
Home Products | Family Dollar
Disaggregation of Revenue [Line Items]
Net sales	$ 227.2	$ 239.5
Home Products | Product Concentration Risk | Revenue, Segment Benchmark | Family Dollar
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	6.60%	7.10%
Apparel And Accessories | Family Dollar
Disaggregation of Revenue [Line Items]
Net sales	$ 164.3	$ 163.2
Apparel And Accessories | Product Concentration Risk | Revenue, Segment Benchmark | Family Dollar
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	4.70%	4.80%
Seasonal And Electronics | Family Dollar
Disaggregation of Revenue [Line Items]
Net sales	$ 274.6	$ 271.6
Seasonal And Electronics | Product Concentration Risk | Revenue, Segment Benchmark | Family Dollar
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	7.90%	8.00%