Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)

v3.19.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
 3 Months Ended 12 Months Ended
Feb. 02, 2019
USD ($)
May 05, 2018
USD ($)
Jul. 29, 2017
USD ($)
Apr. 29, 2017
USD ($)
Feb. 02, 2019
USD ($)
state
province
distribution_center
segment
Feb. 03, 2018
USD ($)
Jan. 28, 2017
USD ($)
Feb. 03, 2019
USD ($)
Jan. 30, 2016
store
Property, Plant and Equipment [Line Items]                  
Number of retail discount stores         15,200        
Number of U.S. States, stores operating in | state         48        
Number of Canadian provinces | province         5        
Number of reportable Segments | segment         2        
Money market securities valued at cost, in Cash and cash equivalents $ 170,000,000       $ 170,000,000 $ 674,100,000      
Debt instruments with original maturities in months, considered cash equivalents, range maximum (in months)         3 months        
Settlement of debit card and credit card transaction process business days, range maximum (in business days)         3 months        
Warehousing and distribution costs capitalized into inventory 161,100,000       $ 161,100,000 137,400,000      
Software amortization period (in years)         3 years        
Interest Costs Capitalized         $ 4,200,000 2,300,000 $ 2,400,000    
Asset Impairment Charges     $ 2,600,000 $ 50,900,000 0 18,500,000 0    
Impairment charge for certain store assets 13,000,000       13,000,000 5,600,000 3,700,000    
Impairment of Long-Lived Assets to be Disposed of 6,000,000       6,000,000 900,000      
Amortization expense         65,400,000 69,200,000 75,700,000    
Advertising costs         99,900,000 106,300,000 60,100,000    
Stock-based compensation expense         63,300,000 65,800,000 60,300,000    
Payments Related to Tax Withholding for Share-based Compensation         23,200,000 27,400,000 22,200,000    
Goodwill impairment         2,727,000,000 0 $ 0    
Assets 13,501,200,000       13,501,200,000 16,332,800,000      
Liabilities 7,858,300,000       7,858,300,000 9,150,500,000      
Fair Value, Inputs, Level 1 [Member]                  
Property, Plant and Equipment [Line Items]                  
Deferred compensation plan assets 21,800,000       21,800,000 20,700,000      
Secure Senior Notes and Acquisition Notes [Member] | Fair Value, Inputs, Level 1 [Member]                  
Property, Plant and Equipment [Line Items]                  
Long-term debt, fair value 4,198,600,000       4,198,600,000 3,684,600,000      
Long term debt - term loans [Member] | Fair Value, Inputs, Level 2 [Member]                  
Property, Plant and Equipment [Line Items]                  
Long-term debt, fair value 0       $ 0 2,187,600,000      
Buildings [Member] | Minimum [Member]                  
Property, Plant and Equipment [Line Items]                  
Useful life (in years)         39 years        
Buildings [Member] | Maximum [Member]                  
Property, Plant and Equipment [Line Items]                  
Useful life (in years)         40 years        
Furniture, fixtures and equipment [Member] | Minimum [Member]                  
Property, Plant and Equipment [Line Items]                  
Useful life (in years)         3 years        
Furniture, fixtures and equipment [Member] | Maximum [Member]                  
Property, Plant and Equipment [Line Items]                  
Useful life (in years)         15 years        
Dollar Tree [Member]                  
Property, Plant and Equipment [Line Items]                  
Price point         $ 1.00        
Goodwill impairment         0        
Assets 4,310,100,000       $ 4,310,100,000 4,113,400,000      
Family Dollar [Member]                  
Property, Plant and Equipment [Line Items]                  
Number of distribution centers | distribution_center         11        
Goodwill impairment 2,730,000,000       $ 2,727,000,000        
Assets 9,191,100,000       $ 9,191,100,000 12,219,400,000      
UNITED STATES | Dollar Tree [Member]                  
Property, Plant and Equipment [Line Items]                  
Number of distribution centers | distribution_center         12        
CANADA | Dollar Tree [Member]                  
Property, Plant and Equipment [Line Items]                  
Number of distribution centers | distribution_center         2        
Family Dollar [Member]                  
Property, Plant and Equipment [Line Items]                  
Asset Impairment Charges         $ 18,500,000 53,500,000      
Settlement received           $ 35,000,000      
Number of stores required for divestiture | store                 330
Accounting Standards Update 2016-15 [Member]                  
Property, Plant and Equipment [Line Items]                  
Payment for Debt Extinguishment or Debt Prepayment Cost   $ 124,500,000              
Accounting Standards Update 2017-04 [Member]                  
Property, Plant and Equipment [Line Items]                  
Goodwill impairment $ 2,730,000,000                
Accounting Standards Update 2016-02 [Member] | Forecast [Member]                  
Property, Plant and Equipment [Line Items]                  
Off-Market Lease, Favorable (Unfavorable), Net               $ 210,000,000  
Accounting Standards Update 2016-02 [Member] | Forecast [Member] | Minimum [Member]                  
Property, Plant and Equipment [Line Items]                  
Operating lease liabilities               6,100,000,000  
Right-of-use assets               6,000,000,000  
Accounting Standards Update 2016-02 [Member] | Forecast [Member] | Maximum [Member]                  
Property, Plant and Equipment [Line Items]                  
Operating lease liabilities               6,200,000,000  
Right-of-use assets               $ 6,300,000,000