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EMPLOYEE BENEFIT PLANS (Details) $ in Millions | 12 Months Ended
--- | ---
Feb. 03, 2018 USD ($) Years_Old hour | Jan. 28, 2017 USD ($) | Jan. 30, 2016 USD ($)
Profit Sharing and 401(k) Retirement Plan [Abstract] |  |  |
Age over which all employees have 401K benefits available | Years_Old | 21 |  |
Employee service years required for available 401K benefits (in years) | one |  |
Minimum hours in a 401K qualifying one year period (in hours) | hour | 1,000 |  |
Profit Sharing Vesting Schedule |  |  |
Percentage Vested in the Profit Sharing Plan After Two Years of Service (in Hundreths) | 20.00% |  |
Years of Service Required to vest 20% in the Profit Sharing Plan | 2 years |  |
Percentage Vested in the Profit Sharing Plan After Three Years of Service (in Hundreths) | 40.00% |  |
Years of Service Required to vest 40% in the Profit Sharing Plan | 3 years |  |
Percentage Vested in the Profit Sharing Plan After Four Years of Service (in Hundreths) | 60.00% |  |
Years of Service Required to vest 60% in the Profit Sharing Plan | 4 years |  |
Percentage Vested in the Profit Sharing Plan After Five Years of Service (in Hundreths) | 100.00% |  |
Years of Service Required to vest 100% in the Profit Sharing Plan | 5 years |  |
Deferred Compensation Plan [Abstract] |  |  |
Cumulative participant deferrals | $ 5.7 | $ 5.2 |
Family Dollar [Member] |  |  |
Deferred Compensation Plan [Abstract] |  |  |
Cumulative participant deferrals | 15.0 | 14.6 |
Postemployment Retirement Benefits [Member] |  |  |
Profit Sharing and 401(k) Retirement Plan [Abstract] |  |  |
Contributions to expenses of the plans | 52.9 | 49.1 | $ 42.8
Dollar Tree Retirement Savings Plan, formerly Dollar Tree Inc. Affiliates and Subsidiaries Profit Sharing and 401(k) Retirement Plan [Member] | Postemployment Retirement Benefits [Member] |  |  |
Profit Sharing and 401(k) Retirement Plan [Abstract] |  |  |
Contributions to expenses of the plans | 52.9 | 39.9 | 36.6
Family Dollar Employee Savings and Retirement Plan and Trust [Member] | Postemployment Retirement Benefits [Member] |  |  |
Profit Sharing and 401(k) Retirement Plan [Abstract] |  |  |
Contributions to expenses of the plans | 0.0 | 9.2 | 6.2
Cost of Sales [Member] | Postemployment Retirement Benefits [Member] |  |  |
Profit Sharing and 401(k) Retirement Plan [Abstract] |  |  |
Contributions to expenses of the plans | $ 7.8 | $ 7.9 | $ 7.4

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- Definition The percentage an employee has vested in the profit sharing plan after five years of service. + References No definition available. + Details
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- Definition The percentage an employee has vested in the profit sharing plan after four years of service. + References No definition available. + Details
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- Definition The percentage an employee has vested in the profit sharing plan after three years of service. + References No definition available. + Details
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- Definition The years of service required for an employee to vest 100% in the profit sharing plan. + References No definition available. + Details
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- Definition The years of service required for an employee to vest 20% in the profit sharing plan. + References No definition available. + Details
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- Definition The years of service required for an employee to vest 40% in the profit sharing plan. + References No definition available. + Details
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- Definition The years of service required for an employee to vest 60% in the profit sharing plan. + References No definition available. + Details
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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements payable after one year (or the normal operating cycle, if longer). Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date. + References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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