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COMMITMENTS AND CONTINGENCIES (Narrative) (Details) ft² in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Aug. 31, 2017 plantiff | Jul. 31, 2017 plantiff | Jun. 30, 2017 USD ($) | May 31, 2017 ft² option | Jun. 30, 2016 plantiff | Apr. 30, 2016 USD ($) | Feb. 03, 2018 USD ($) letter_of_credit
Operating Lease Commitments [Abstract] |  |  |  |  |  |  |
Expected future minimum sublease rentals |  |  |  |  |  |  | $ 900,000
Letters of Credit [Abstract] |  |  |  |  |  |  |
Letters of Credit Outstanding, Number | letter_of_credit |  |  |  |  |  |  | 3
Letter of Credit Reimbursement and Security Agreement capacity |  |  |  |  |  |  | $ 120,000,000
Second Letter of Credit Reimbursement and Security Agreement amount |  |  |  |  |  |  | 110,000,000
Third Letter of Credit Reimbursement and Security Agreement Amount |  |  |  |  |  |  | 100,000,000
Committed to letters of credit |  |  |  |  |  |  | 168,000,000
Stand-by letters of credit |  |  |  |  |  |  | 158,200,000
Surety Bonds [Abstract] |  |  |  |  |  |  |
Surety bonds |  |  |  |  |  |  | 86,200,000
Build-to-Suit Lease and Related Bonds |  |  |  |  |  |  |
Area of distribution center to be constructed under the Missouri Lease (sq ft) | ft² |  |  |  | 1.0 |  |  |
Number of options to extend the Missouri Lease term | option |  |  |  | 2 |  |  |
Term of optional extension to the Missouri Lease |  |  |  | 10 years |  |  |
Costs capitalized in construction in progress related to the Distribution Center Project |  |  |  |  |  |  | 53,700,000
Dollar Tree Resolved Matters |  |  |  |  |  |  |
Settlement received |  |  |  |  |  |  | 35,000,000
Failure To Reimburse Employees For Clothing Constituting Uniforms In Violation Of California Law [Member] |  |  |  |  |  |  |
Dollar Tree Resolved Matters |  |  |  |  |  |  |
Number of plaintiffs that have filed suit | plantiff |  | 2 |  |  |  |  |
Failure To Remit Overtime Compensation, Breaks, Accurate Wage Statements, And Final Pay Upon Termination [Member] |  |  |  |  |  |  |
Dollar Tree Resolved Matters |  |  |  |  |  |  |
Number of plaintiffs that have filed suit | plantiff | 43 |  |  |  |  |  |
Discriminatory Practices Case [Member] |  |  |  |  |  |  |
Dollar Tree Resolved Matters |  |  |  |  |  |  |
Number of plaintiffs that have filed suit | plantiff |  |  |  |  | 30,000 |  |
Minimum [Member] | Fair Credit Reporting Act Violation [Member] |  |  |  |  |  |  |
Dollar Tree/Family Dollar Active Matters |  |  |  |  |  |  |
Statutory damages sought by plaintiff per violation |  |  |  |  |  | $ 100 |
Maximum [Member] | Fair Credit Reporting Act Violation [Member] |  |  |  |  |  |  |
Dollar Tree/Family Dollar Active Matters |  |  |  |  |  |  |
Statutory damages sought by plaintiff per violation |  |  |  |  |  | $ 1,000 |
Telecom Contracts [Member] |  |  |  |  |  |  |
Communications and Information Technology [Abstract] |  |  |  |  |  |  |
Total commitment |  |  |  |  |  |  | $ 130,300,000
Settled Litigation [Member] | Suit Against Sycamore Partners And Dollar Express [Member] |  |  |  |  |  |  |
Dollar Tree Resolved Matters |  |  |  |  |  |  |
Damages sought (in excess of) |  |  | $ 52,000,000 |  |  |  |
Settlement received |  |  | 35,000,000 |  |  |  |
Sycamore Partners And Dollar Express LLC [Member] | Settled Litigation [Member] | Sycamore Partners And Dollar Express Countersuit Against Dollar Tree [Member] |  |  |  |  |  |  |
Dollar Tree Resolved Matters |  |  |  |  |  |  |
Damages sought (in excess of) |  |  | $ 500,000,000 |  |  |  |

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