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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 300,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals 300,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals 300,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals
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 20,000,000dltr_ThirdLetterofCreditReimbursementandSecurityAgreementAmount 20,000,000dltr_ThirdLetterofCreditReimbursementandSecurityAgreementAmount 20,000,000dltr_ThirdLetterofCreditReimbursementandSecurityAgreementAmount
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 13,500,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= dltr_TechnologyAssetsMember
13,500,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= dltr_TechnologyAssetsMember
13,500,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= dltr_TechnologyAssetsMember
Telecom Contracts [Member]      
Communications and Information Technology [Abstract]      
Total commitment 16,800,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= dltr_TelecommunicationContractsMember
16,800,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= dltr_TelecommunicationContractsMember
16,800,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= dltr_TelecommunicationContractsMember
Line of Credit [Member]      
Letters of Credit [Abstract]      
Available letter of credit capacity 150,000,000.0dltr_LetterOfCreditFacilityIssuanceCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
150,000,000.0dltr_LetterOfCreditFacilityIssuanceCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
150,000,000.0dltr_LetterOfCreditFacilityIssuanceCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Revolving line of credit capacity 750,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
750,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
750,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
ResolvedLitigationCalifornia'sPrivateAttorneyGeneralAct [Member] [Member]      
Loss Contingency [Abstract]      
Number of plaintiffs 2us-gaap_LossContingencyNumberOfPlaintiffs
/ us-gaap_LitigationCaseAxis
= dltr_ResolvedLitigationCaliforniasPrivateAttorneyGeneralActMemberMember
   
Loss Contingency, Claims Settled and Dismissed, Number 1us-gaap_LossContingencyClaimsSettledAndDismissedNumber
/ us-gaap_LitigationCaseAxis
= dltr_ResolvedLitigationCaliforniasPrivateAttorneyGeneralActMemberMember
   
Winn Dixie Exclusive Selling Rights Violations Member      
Loss Contingency [Abstract]      
Number of Operating Locations Affected   48dltr_LossContingencyNumberOfOperatingLocationsAffected
/ us-gaap_LitigationCaseAxis
= dltr_WinnDixieExclusiveSellingRightsViolationsMember
 
Action Taken by Court, Claims of Adverse Descision and Injunctive Relief, Number   1dltr_LossContingencyActionTakenByCourtClaimsOfAdverseDescisionAndInjunctiveReliefNumber
/ us-gaap_LitigationCaseAxis
= dltr_WinnDixieExclusiveSellingRightsViolationsMember
 
Stores Required To Restrict Sales Of Food   21dltr_StoresRequiredToRestrictSalesOfFood
/ us-gaap_LitigationCaseAxis
= dltr_WinnDixieExclusiveSellingRightsViolationsMember
 
Restricted Square Footage Area   500dltr_RestrictedSquareFootageArea
/ us-gaap_LitigationCaseAxis
= dltr_WinnDixieExclusiveSellingRightsViolationsMember
 
Previously Restricted Number of Stores   21dltr_PreviouslyRestrictedNumberofStores
/ us-gaap_LitigationCaseAxis
= dltr_WinnDixieExclusiveSellingRightsViolationsMember
 
Previously Restricted Square Footage Area   500dltr_PreviouslyRestrictedSquareFootageArea
/ us-gaap_LitigationCaseAxis
= dltr_WinnDixieExclusiveSellingRightsViolationsMember
 
Pending Or Threatened Litigation Multi State Litigation Member      
Loss Contingency [Abstract]      
Number of opt-in plaintiffs     4,300dltr_LossContingencyNumberOfOptInPlaintiffs
/ us-gaap_LitigationCaseAxis
= dltr_PendingOrThreatenedLitigationMultiStateLitigationMember