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STOCK-BASED COMPENSATION PLAN (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Mar. 18, 2016 | Feb. 03, 2018 | Jan. 28, 2017 | Jan. 30, 2016 | Jan. 31, 2015 | Feb. 02, 2013 | Jan. 28, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Expected term |  |  |  |  | 3 months | 3 months | 3 months
Intrinsic value of options exercised |  | $ 18.3 | $ 11.8 | $ 13.2 |  |  |
Minimum statutory tax withholding related to vested restricted shares |  | 27.4 | 21.9 | 21.6 |  |  |
Stock-based compensation expense |  | $ 65.8 | 60.3 | 52.3 |  |  |
Granted (shares) |  | 890,371 |  |  |  |  |
Total fair value of vested restricted shares |  | $ 60.3 | $ 42.4 | $ 36.8 |  |  |
Aggregate intrinsic value of options outstanding |  | $ 20.2 |  |  |  |  |
Employee Stock Option [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Expected term |  | 6 years 6 months | 2 years 11 days |  |  |  |
Service Based Awards [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  | 3 years |  |  |  |  |
Restricted stock granted under service and performance awards (in shares) |  | 500,000 | 500,000 | 300,000 |  |  |
Stock-based compensation expense |  | $ 32.2 | $ 28.2 | $ 22.6 |  |  |
Unrecognized compensation expense |  | $ 35.6 |  |  |  |  |
Weighted average period of recognition (in months) |  | 1 year 10 months 9 days |  |  |  |  |
Director Deferred Compensation Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Expected term |  |  |  | 10 years |  |  |
Percentage of the share price of common stock used in the calculation to determine the number of options issued to a director (in hundredths) |  |  |  | 33.00% |  |  |
Omnibus Incentive Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  |  |  | 3 years |  |  |
Expected term |  |  |  | 10 years |  |  |
Shares available for grant |  |  |  | 4,000,000 |  |  |
Omnibus Incentive Plan [Member] | Certain officers [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Options granted (in shares) |  |  | 200,000.0 |  |  |  |
Fair value of stock options granted |  |  | $ 4.0 |  |  |  |
Omnibus Incentive Plan [Member] | Employee Stock Option [Member] | Certain officers [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  |  | 5 years |  |  |  |
Stock-based compensation expense |  | $ 1.3 |  |  |  |  |
Omnibus Incentive Plan [Member] | Service Based Awards [Member] | Ratable Annual Vesting [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Compensation expensed over the service period |  |  | $ 7.9 |  |  |  |
Omnibus Incentive Plan [Member] | Performance And Service Based Awards [Member] | Ratable Annual Vesting [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock granted under service and performance awards (in shares) |  | 300,000 | 200,000 |  |  |  |
Compensation expensed over the service period |  | $ 19.7 | $ 17.1 |  |  |  |
Stock-based compensation expense |  |  | $ 11.4 |  |  |  |
Service period |  | 3 years | 3 years |  |  |  |
Omnibus Incentive Plan [Member] | Performance And Service Based Awards [Member] | Certain officers [Member] | Ratable Annual Vesting [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock granted under service and performance awards (in shares) |  |  |  | 100,000 |  |  |
Compensation expensed over the service period |  |  |  | $ 11.3 |  |  |
Allocated Share Based Compensation Expense Restricted Stock2012 Grants |  | $ 1.0 | $ 1.8 | $ 8.7 |  |  |
Service period |  |  |  | 3 years |  |  |
Omnibus Incentive Plan [Member] | Performance And Service Based Awards [Member] | President [Member] | Ratable Annual Vesting [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period | 5 years |  |  |  |  |  |
Stock-based compensation expense |  | 1.0 | 0.8 |  |  |  |
Granted (shares) | 100,000 |  |  |  |  |  |
Target Value | $ 5.0 |  |  |  |  |  |
Service period | 5 years |  |  |  |  |  |
Omnibus Incentive Plan [Member] | Performance And Service Based Awards [Member] | Chief Executive Officer [Member] | Ratable Annual Vesting [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock granted under service and performance awards (in shares) |  |  |  |  |  | 200,000 |
Stock-based compensation expense |  | $ 0.7 | $ 2.0 | $ 2.0 |  |  |
Target Value |  |  |  |  |  | $ 10.0 |
Service period |  |  | 5 years |  |  |  |
Omnibus Incentive Plan [Member] | Performance And Service Based Awards [Member] | Restricted Stock Units (RSUs) [Member] | Certain officers [Member] | Vesting at End of Performance Period [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Individual potential target award, minimum (in hundredths) |  |  |  | 0.00% | 0.00% |  |
Individual Potential Target Award Maximum |  |  |  | 200.00% | 200.00% |  |
Omnibus Incentive Plan [Member] | Performance Shares [Member] | Restricted Stock Units (RSUs) [Member] | Certain officers [Member] | Vesting at End of Performance Period [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Target Value |  |  |  | $ 2.3 | $ 1.7 |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Weighted average fair value of granted purchase rights (in dollars per share) |  | $ 13,620,000.00 | $ 13,430,000.00 | $ 11,650,000.00 |  |  |
Stock-based compensation expense |  | $ 2.0 | $ 1.6 | $ 1.0 |  |  |
Employee stock purchase plan shares of common stock authorized for issuance |  | 8,707,692 |  |  |  |  |
Amount allowed to be withheld to purchase Common Stock |  | 10.00% |  |  |  |  |
ESPP Plan purchase price of stock (in hundredths) |  | 85.00% |  |  |  |  |
Shares sold under the ESPP |  | 5,138,468 |  |  |  |  |
2016 Restricted Stock Grant - Officers [Member] | Omnibus Incentive Plan [Member] | Performance And Service Based Awards [Member] | Certain officers [Member] | Ratable Annual Vesting [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation expense |  | $ 13.7 |  |  |  |  |
2016 Restricted Stock Grant - Officers [Member] | Omnibus Incentive Plan [Member] | Performance And Service Based Awards [Member] | Restricted Stock Units (RSUs) [Member] | Certain officers [Member] | Vesting at End of Performance Period [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Target Value |  | $ 4.6 |  |  |  |  |
Individual potential target award, minimum (in hundredths) |  | 0.00% |  |  |  |  |
Individual Potential Target Award Maximum |  | 200.00% |  |  |  |  |
2016 Restricted Stock Grant - Officers [Member] | Omnibus Incentive Plan [Member] | Performance Shares [Member] | Restricted Stock Units (RSUs) [Member] | Certain officers [Member] | Vesting at End of Performance Period [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation expense |  | $ 2.6 |  |  |  |  |
2015 Restricted Stock Grant - Officers [Member] | Omnibus Incentive Plan [Member] | Performance And Service Based Awards [Member] | Certain officers [Member] | Ratable Annual Vesting [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation expense |  | 2.0 |  |  |  |  |
2015 Restricted Stock Grant - Officers [Member] | Omnibus Incentive Plan [Member] | Performance And Service Based Awards [Member] | Restricted Stock Units (RSUs) [Member] | Certain officers [Member] | Vesting at End of Performance Period [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Target Value |  |  | $ 3.2 |  |  |  |
Individual potential target award, minimum (in hundredths) |  |  | 0.00% |  |  |  |
Individual Potential Target Award Maximum |  |  | 200.00% |  |  |  |
2015 Restricted Stock Grant - Officers [Member] | Omnibus Incentive Plan [Member] | Performance Shares [Member] | Restricted Stock Units (RSUs) [Member] | Certain officers [Member] | Vesting at End of Performance Period [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation expense |  | 0.5 | $ 2.0 |  |  |  |
Fair value of stock options granted |  | 3.2 |  |  |  |  |
2014 Restricted Stock Grant - Officers [Member] | Omnibus Incentive Plan [Member] | Performance Shares [Member] | Restricted Stock Units (RSUs) [Member] | Certain officers [Member] | Vesting at End of Performance Period [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation expense |  | 0.8 | 2.3 | 1.4 |  |  |
Family Dollar [Member] | Employee Stock Option [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation expense |  | $ 1.3 | 2.6 | 6.2 |  |  |
Conversion of Stock, Award Exchange Ratio |  | 1.0000 |  |  |  |  |
Conversion of Stock, Shares Converted |  | 1,500,000 |  |  |  |  |
Family Dollar [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation expense |  | $ 0.7 | $ 1.8 | 2.8 |  |  |
Conversion of Stock, Award Exchange Ratio |  | 1.0000 |  |  |  |  |
Conversion of Stock, Shares Converted |  | 100,000 |  |  |  |  |
2013 LTPP REGRANT [Member] | Omnibus Incentive Plan [Member] | Performance And Service Based Awards [Member] | Restricted Stock Units (RSUs) [Member] | Certain officers [Member] | Vesting at End of Performance Period [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  |  | 1 year |  |  |  |
Stock-based compensation expense |  |  | $ 0.2 | 2.4 |  |  |
Target Value |  |  | 2.2 |  |  |  |
2013 ORIGINAL LTPP GRANT [Member] | Omnibus Incentive Plan [Member] | Performance And Service Based Awards [Member] | Restricted Stock Units (RSUs) [Member] | Certain officers [Member] | Vesting at End of Performance Period [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation expense |  |  | $ 1.2 |  |  |  |
Family Dollar [Member] | Service Based Awards [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |  |
Stock-based compensation expense |  | $ 1.6 | $ 2.0 | $ 1.0 |  |  |
Granted (shares) |  |  | 100,000 |  |  |  |

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