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SEGMENT REPORTING (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 03, 2018 USD ($) | Jan. 28, 2017 USD ($) | Oct. 29, 2016 USD ($) | Jul. 30, 2016 USD ($) | Apr. 30, 2016 USD ($) | Oct. 31, 2015 USD ($) | Aug. 01, 2015 USD ($) | May 02, 2015 USD ($) | Oct. 29, 2016 segment | Feb. 03, 2018 USD ($) state province distribution_center | Jan. 28, 2017 USD ($) | Jan. 30, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |
Net sales | $ 6,360,600,000 | $ 5,635,300,000 | $ 5,316,600,000 | $ 5,281,200,000 | $ 5,287,100,000 | $ 5,001,600,000 | $ 4,996,300,000 | $ 5,085,800,000 |  | $ 22,245,500,000 | $ 20,719,200,000 | $ 15,498,400,000
Gross profit | 2,101,000,000 | 1,807,000,000 | 1,666,000,000 | 1,627,800,000 | 1,627,100,000 | 1,520,500,000 | 1,512,400,000 | 1,554,600,000 |  | 7,021,900,000 | 6,394,700,000 | 4,656,700,000
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  | 611,500,000 | 637,800,000 | 487,700,000
Operating income | 765,600,000 | 586,500,000 | $ 425,200,000 | $ 419,500,000 | $ 388,800,000 | $ 342,400,000 | $ 357,200,000 | $ 418,700,000 |  | 1,999,100,000 | 1,704,800,000 | 1,049,700,000
Assets | 16,332,800,000 | 15,701,600,000 |  |  |  |  |  |  |  | 16,332,800,000 | 15,701,600,000 |
Goodwill | 5,025,200,000 | 5,023,500,000 |  |  |  |  |  |  |  | 5,025,200,000 | 5,023,500,000 |
Goodwill transfers |  |  |  |  |  |  |  |  |  | 60,000,000 |  |
Dollar Tree [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Price point |  |  |  |  |  |  |  |  |  | 1.00 |  |
Net sales |  |  |  |  |  |  |  |  |  | 11,164,400,000 | 10,138,700,000 | 9,336,400,000
Gross profit |  |  |  |  |  |  |  |  |  | 3,998,500,000 | 3,584,700,000 | 3,249,300,000
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  | 251,800,000 | 241,300,000 | 223,400,000
Operating income |  |  |  |  |  |  |  |  |  | 1,481,900,000 | 1,305,300,000 | 1,080,500,000
Assets | 4,113,400,000 | 3,705,500,000 |  |  |  |  |  |  |  | 4,113,400,000 | 3,705,500,000 |
Goodwill | 347,100,000 | 345,400,000 |  |  |  |  |  |  |  | $ 347,100,000 | 345,400,000 |
Dollar Tree [Member] | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of distribution centers | distribution_center |  |  |  |  |  |  |  |  |  | 11 |  |
Dollar Tree [Member] | CANADA |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of distribution centers | distribution_center |  |  |  |  |  |  |  |  |  | 2 |  |
Family Dollar [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of distribution centers | distribution_center |  |  |  |  |  |  |  |  |  | 11 |  |
Net sales |  |  |  |  |  |  |  |  |  | $ 11,081,100,000 | 10,580,500,000 | 6,162,000,000
Gross profit |  |  |  |  |  |  |  |  |  | 3,023,400,000 | 2,810,000,000 | 1,407,400,000
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  | 359,700,000 | 396,500,000 | 264,300,000
Operating income |  |  |  |  |  |  |  |  |  | 517,200,000 | 399,500,000 | $ (30,800,000)
Assets | 12,219,400,000 | 11,996,100,000 |  |  |  |  |  |  |  | 12,219,400,000 | 11,996,100,000 |
Goodwill | $ 4,678,100,000 | $ 4,678,100,000 |  |  |  |  |  |  |  | $ 4,678,100,000 | $ 4,678,100,000 |

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