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QUARTERLY FINANCIAL INFORMATION (Details) $ / shares in Units, $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 01, 2018 USD ($) | Jan. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Feb. 03, 2018 USD ($) store $ / shares | Jul. 29, 2017 USD ($) $ / shares | Apr. 29, 2017 USD ($) $ / shares | Jan. 28, 2017 USD ($) store $ / shares | Oct. 29, 2016 USD ($) store $ / shares | Jul. 30, 2016 USD ($) store $ / shares | Apr. 30, 2016 USD ($) store $ / shares | Oct. 31, 2015 USD ($) store $ / shares | Aug. 01, 2015 USD ($) store $ / shares | May 02, 2015 USD ($) store $ / shares | Jan. 30, 2016 USD ($) | Feb. 03, 2018 USD ($) store $ / shares | Jan. 28, 2017 USD ($) store $ / shares | Jan. 30, 2016 USD ($) $ / shares
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivable impairment |  |  |  |  | $ 2.6 | $ 50.9 |  |  |  |  |  |  |  |  | $ 18.5 | $ 0.0 | $ 0.0
Settlement received |  |  |  | $ 35.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Effect of impairment charges and settlement on net income |  |  |  | $ 21.4 | $ 1.6 | $ 31.6 |  |  |  |  |  |  |  |  |  |  |
Effect of impairment charges and settlement on diluted net income per share (in USD per share) | $ / shares |  |  |  | $ 0.09 | $ 0.01 | $ 0.13 |  |  |  |  |  |  |  |  |  |  |
Effect of change in reserves on net income |  |  |  | $ 8.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Effect of change in reserves on diluted net income per share (in USD per share) | $ / shares |  |  |  | $ 0.03 |  |  |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  | $ 6,360.6 |  |  | $ 5,635.3 | $ 5,316.6 | $ 5,281.2 | $ 5,287.1 | $ 5,001.6 | $ 4,996.3 | $ 5,085.8 |  | 22,245.5 | 20,719.2 | 15,498.4
Gross profit |  |  |  | 2,101.0 |  |  | 1,807.0 | 1,666.0 | 1,627.8 | 1,627.1 | 1,520.5 | 1,512.4 | 1,554.6 |  | 7,021.9 | 6,394.7 | 4,656.7
Operating income |  |  |  | 765.6 |  |  | 586.5 | 425.2 | 419.5 | 388.8 | 342.4 | 357.2 | 418.7 |  | 1,999.1 | 1,704.8 | 1,049.7
Net income |  |  |  | $ 1,040.1 |  |  | $ 321.8 | $ 239.9 | $ 233.8 | $ 200.5 | $ 171.6 | $ 170.2 | $ 232.7 |  | $ 1,714.3 | $ 896.2 | $ 282.4
Diluted net income per share (usd per share) | $ / shares |  |  |  | $ 4.37 |  |  | $ 1.36 | $ 1.01 | $ 0.98 | $ 0.85 | $ 0.72 | $ 0.72 | $ 0.98 |  | $ 7.21 | $ 3.78 | $ 1.26
Stores open at end of quarter | store |  |  |  | 14,835 |  |  | 14,334 | 14,744 | 14,581 | 14,482 | 14,284 | 14,129 | 13,997 |  | 14,835 | 14,334 |
Comparable store net sales change (in hundredths) |  |  |  | 2.50% |  |  | 1.30% | 3.30% | 2.40% | 0.50% | 1.80% | 1.10% | 2.20% |  |  |  |
Selling, general and administrative expenses, excluding Receivable impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,022.8 | $ 4,689.9 | $ 3,607.0
Inventory write-down |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 73.0 |  |  |
Effect Of Tax Cuts And Jobs Act Of 2017 On Net Income |  |  |  | $ 583.7 |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Cuts And Jobs Act Of 2017, Effect On Earnings Per Share, After Tax | $ / shares |  |  |  | $ 2.45 |  |  |  |  |  |  |  |  |  |  |  |  |
Make-whole premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 301.8 | $ 375.5 | $ 599.4
Suit Against Sycamore Partners And Dollar Express [Member] | Settled Litigation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement received |  |  | $ 35.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] | Five Point Two Five Percent Notes Acquired in Acquisition, Due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Call for redemption of 2020 Notes |  | $ 750.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Make-whole premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9.8 |  |
Effect Of Redemption Premium On Net Income |  |  |  | $ 6.2 |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption Premium, Effect On Earnings Per Share, After Tax | $ / shares |  |  |  | $ 0.03 |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Senior Notes [Member] | Five Point Two Five Percent Notes Acquired in Acquisition, Due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of 2020 notes | $ 759.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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