Annual report pursuant to Section 13 and 15(d)

Segment Reporting - Narrative (Details)

v3.20.1
Segment Reporting - Narrative (Details)
$ in Millions
3 Months Ended 12 Months Ended
Feb. 01, 2020
USD ($)
state
store
province
Feb. 02, 2019
USD ($)
store
Feb. 01, 2020
USD ($)
state
store
province
distribution_center
segment
Feb. 02, 2019
USD ($)
store
Feb. 03, 2018
USD ($)
Nov. 02, 2019
store
Aug. 03, 2019
store
May 04, 2019
store
Nov. 03, 2018
store
Aug. 04, 2018
store
May 05, 2018
store
Segment Reporting Information [Line Items]                      
Number of retail discount stores | store 15,288 15,237 15,288 15,237   15,262 15,115 15,264 15,187 15,073 14,957
Number of states/provinces the Company operates in | state 48   48                
Number of reporting business segments | segment     2                
Goodwill transfers     $ 0.0 $ 0.0              
Goodwill impairment     313.0 2,727.0 $ 0.0            
Dollar Tree                      
Segment Reporting Information [Line Items]                      
Goodwill transfers     47.6 31.0              
Goodwill impairment     $ 0.0 0.0              
Family Dollar                      
Segment Reporting Information [Line Items]                      
Number of distribution centers | distribution_center     11                
Goodwill transfers     $ (47.6) (31.0)              
Goodwill impairment $ 313.0 $ 2,730.0 $ 313.0 $ 2,727.0              
Canada                      
Segment Reporting Information [Line Items]                      
Number of states/provinces the Company operates in | province 5   5                
Canada | Dollar Tree                      
Segment Reporting Information [Line Items]                      
Number of distribution centers | distribution_center     2