Dollar Tree, Inc. Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

COMMITMENTS AND CONTINGENCIES (Narrative) (Details)

COMMITMENTS AND CONTINGENCIES (Narrative) (Details) (USD $)	30 Months Ended	43 Months Ended	49 Months Ended
	Jan. 31, 2015 plantiff	Jan. 31, 2015 sqft store locations	Jan. 31, 2015 plantiff
Operating Lease Commitments [Abstract]
Expected future minimum sublease rentals	300,000	300,000	300,000
Letters of Credit [Abstract]
Letters of Credit Outstanding, Number	3dltr_LettersOfCreditOutstandingNumber	3dltr_LettersOfCreditOutstandingNumber	3dltr_LettersOfCreditOutstandingNumber
Letter of Credit Reimbursement and Security Agreement capacity	110,000,000dltr_LettersOfCreditOriginalCapacity	110,000,000dltr_LettersOfCreditOriginalCapacity	110,000,000dltr_LettersOfCreditOriginalCapacity
Second Letter of Credit Reimbursement and Security Agreement amount	100,000,000dltr_LettersOfCreditSecondLineCapacity	100,000,000dltr_LettersOfCreditSecondLineCapacity	100,000,000dltr_LettersOfCreditSecondLineCapacity
Third Letter of Credit Reimbursement and Security Agreement Amount	20,000,000	20,000,000	20,000,000
Committed to letters of credit	162,900,000dltr_LettersOfCreditCommitment	162,900,000dltr_LettersOfCreditCommitment	162,900,000dltr_LettersOfCreditCommitment
Stand-by letters of credit	11,900,000dltr_StandByLettersOfCreditCommitment	11,900,000dltr_StandByLettersOfCreditCommitment	11,900,000dltr_StandByLettersOfCreditCommitment
Surety Bonds [Abstract]
Surety bonds	4,200,000dltr_SuretyBonds	4,200,000dltr_SuretyBonds	4,200,000dltr_SuretyBonds
Technology Assets [Member]
Communications and Information Technology [Abstract]
Total commitment	13,500,000	13,500,000	13,500,000
Telecom Contracts [Member]
Communications and Information Technology [Abstract]
Total commitment	16,800,000	16,800,000	16,800,000
Line of Credit [Member]
Letters of Credit [Abstract]
Available letter of credit capacity	150,000,000.0	150,000,000.0	150,000,000.0
Revolving line of credit capacity	750,000,000	750,000,000	750,000,000
ResolvedLitigationCalifornia'sPrivateAttorneyGeneralAct [Member] [Member]
Loss Contingency [Abstract]
Number of plaintiffs	2
Loss Contingency, Claims Settled and Dismissed, Number	1
Winn Dixie Exclusive Selling Rights Violations Member
Loss Contingency [Abstract]
Number of Operating Locations Affected		48
Action Taken by Court, Claims of Adverse Descision and Injunctive Relief, Number		1
Stores Required To Restrict Sales Of Food		21
Restricted Square Footage Area		500
Previously Restricted Number of Stores		21
Previously Restricted Square Footage Area		500
Pending Or Threatened Litigation Multi State Litigation Member
Loss Contingency [Abstract]
Number of opt-in plaintiffs			4,300