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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) shares in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 06, 2015 USD ($) shares | Jul. 29, 2017 USD ($) | Apr. 29, 2017 USD ($) | Oct. 29, 2016 segment | Feb. 03, 2018 USD ($) state province distribution_center | Jan. 28, 2017 USD ($) | Jan. 30, 2016 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Impairment Of Store Assets |  |  |  |  | $ 3,100,000 | $ 700,000 |
Acquisition cost paid in common stock and equity compensation |  |  |  |  | $ 0 | 0 | $ 2,290,100,000
Number of retail discount stores |  |  |  |  | 14,800 |  |
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 |  |  |  |  | $ 674,100,000 | 554,400,000 |
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 |  |  |  |  | $ 137,400,000 | 116,900,000 |
Software amortization period (in years) |  |  |  |  | 3 years |  |
Interest Costs Capitalized |  |  |  |  | $ 2,300,000 | 2,400,000 |
Asset Impairment Charges |  | $ 2,600,000 | $ 50,900,000 |  | 18,500,000 | 0 | $ 0
Impairment charge for certain store assets |  |  |  |  | 5,600,000 | 3,700,000 | 1,600,000
Impairment of Long-Lived Assets to be Disposed of |  |  |  |  | 2,500,000 | 3,000,000 |
Short-term investments |  |  |  |  | 0 | 4,000,000 |
Advertising costs |  |  |  |  | 106,300,000 | 60,100,000 | 32,500,000
Stock-based compensation expense |  |  |  |  | 65,800,000 | 60,300,000 | 52,300,000
Payments Related to Tax Withholding for Share-based Compensation |  |  |  |  | 27,400,000 | 22,200,000 | 21,600,000
Increase (Decrease) in Other Accounts Payable and Accrued Liabilities |  |  |  |  | (10,100,000) | 24,700,000 | $ 9,700,000
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Short-term investments |  |  |  |  | 0 | 4,000,000 |
Deferred compensation plan assets |  |  |  |  | 20,700,000 | 19,800,000 |
Secure Senior Notes and Acquisition Notes [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Long-term debt |  |  |  |  | 3,684,600,000 | 3,740,300,000 |
Long term debt - term loans [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Long-term debt |  |  |  |  | 2,187,600,000 | 2,828,200,000 |
Restatement Adjustment [Member] | Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Increase (Decrease) in Other Accounts Payable and Accrued Liabilities |  |  |  |  | $ (21,600,000) | $ (16,000,000) |
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 |  |
Family Dollar [Member] |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Number of distribution centers | distribution_center |  |  |  |  | 11 |  |
UNITED STATES | Dollar Tree [Member] |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Number of distribution centers | distribution_center |  |  |  |  | 11 |  |
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] |  |  |  |  |  |  |
Business Combination, Consideration Transferred | $ 6,800,000,000 |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares | 28.5 |  |  |  |  |  |
Acquisition cost paid in common stock and equity compensation | $ 2,300,000,000 |  |  |  |  |  |

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