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Segments - Narrative (Details)
9 Months Ended
Oct. 31, 2020
USD ($)
state
store
segment
province
distribution_center
Segment Reporting Information [Line Items]  
Number of retail discount stores | store 15,600
Number of states/provinces the Company operates in | state 48
Number of reporting business segments | segment 2
Dollar Tree  
Segment Reporting Information [Line Items]  
Merchandise fixed price | $ $ 1.00
Family Dollar  
Segment Reporting Information [Line Items]  
Number of distribution centers 11
Canada  
Segment Reporting Information [Line Items]  
Number of states/provinces the Company operates in | province 5
Canada | Dollar Tree  
Segment Reporting Information [Line Items]  
Number of distribution centers 2
United States | Dollar Tree  
Segment Reporting Information [Line Items]  
Number of distribution centers 15