Segments and Disaggregated Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Feb. 03, 2024	Jan. 28, 2023	Jan. 29, 2022
Disaggregation of Revenue [Line Items]
Total net sales	$ 30,581.6	$ 28,318.2	$ 26,309.8
Dollar Tree
Disaggregation of Revenue [Line Items]
Total net sales	16,770.3	15,405.7	13,922.1
Family Dollar
Disaggregation of Revenue [Line Items]
Total net sales	$ 13,811.3	$ 12,912.5	$ 12,387.7
Product Concentration Risk | Revenue, Segment Benchmark | Dollar Tree
Disaggregation of Revenue [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%
Product Concentration Risk | Revenue, Segment Benchmark | Family Dollar
Disaggregation of Revenue [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%
Consumable | Dollar Tree
Disaggregation of Revenue [Line Items]
Total net sales	$ 7,915.6	$ 6,978.8	$ 6,334.5
Consumable | Family Dollar
Disaggregation of Revenue [Line Items]
Total net sales	$ 11,086.1	$ 10,036.2	$ 9,446.5
Consumable | Product Concentration Risk | Revenue, Segment Benchmark | Dollar Tree
Disaggregation of Revenue [Line Items]
Concentration risk percentage	47.20%	45.30%	45.50%
Consumable | Product Concentration Risk | Revenue, Segment Benchmark | Family Dollar
Disaggregation of Revenue [Line Items]
Concentration risk percentage	80.30%	77.70%	76.30%
Variety | Dollar Tree
Disaggregation of Revenue [Line Items]
Total net sales	$ 7,781.4	$ 7,456.3	$ 6,794.0
Variety | Product Concentration Risk | Revenue, Segment Benchmark | Dollar Tree
Disaggregation of Revenue [Line Items]
Concentration risk percentage	46.40%	48.40%	48.80%
Seasonal | Dollar Tree
Disaggregation of Revenue [Line Items]
Total net sales	$ 1,073.3	$ 970.6	$ 793.6
Seasonal | Product Concentration Risk | Revenue, Segment Benchmark | Dollar Tree
Disaggregation of Revenue [Line Items]
Concentration risk percentage	6.40%	6.30%	5.70%
Home products | Family Dollar
Disaggregation of Revenue [Line Items]
Total net sales	$ 930.0	$ 982.5	$ 1,033.9
Home products | Product Concentration Risk | Revenue, Segment Benchmark | Family Dollar
Disaggregation of Revenue [Line Items]
Concentration risk percentage	6.70%	7.60%	8.30%
Apparel and accessories | Family Dollar
Disaggregation of Revenue [Line Items]
Total net sales	$ 673.4	$ 732.2	$ 781.5
Apparel and accessories | Product Concentration Risk | Revenue, Segment Benchmark | Family Dollar
Disaggregation of Revenue [Line Items]
Concentration risk percentage	4.90%	5.70%	6.30%
Seasonal and electronics | Family Dollar
Disaggregation of Revenue [Line Items]
Total net sales	$ 1,121.8	$ 1,161.6	$ 1,125.8
Seasonal and electronics | Product Concentration Risk | Revenue, Segment Benchmark | Family Dollar
Disaggregation of Revenue [Line Items]
Concentration risk percentage	8.10%	9.00%	9.10%