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LONG-TERM DEBT (Details) (USD $)
12 Months Ended
Jan. 31, 2015
Mar. 03, 2014
Feb. 01, 2014
Sep. 16, 2013
Debt Instrument Additional Information        
Long-Term Debt $ 757,000,000us-gaap_DebtInstrumentCarryingAmount   $ 769,800,000us-gaap_DebtInstrumentCarryingAmount  
Current Portion of Long-Term Debt 0us-gaap_LongTermDebtCurrent   12,800,000us-gaap_LongTermDebtCurrent  
Long-term debt, excluding current portion 757,000,000us-gaap_LongTermDebtNoncurrent   757,000,000us-gaap_LongTermDebtNoncurrent  
2017 Maturities 200,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree      
2018 Maturities 1,400,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour      
2019 Maturities 1,400,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive      
Maturities after 2019 754,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive      
Long-Term Debt, by Maturity        
Demand Revenue Bond Debt Repayment   12,800,000dltr_DemandRevenueBondDebtRepayment    
Long-term Debt, Prepayment option at any time in amount not less than percent shown of the original aggregate amount       5.00%dltr_LongtermDebtPrepaymentoptionatanytimeinamountnotlessthanpercentshownoftheoriginalaggregateamount
Long-term debt, prepayment option at a price equal to the sum of (a) 100% of the principal amount thereof, plus any accrued and unpaid interest       100.00%dltr_Longtermdebtprepaymentoptionatapriceequaltothesumofa100oftheprincipalamountthereofplusanyaccruedandunpaidinterest
Debt Instrument, Interest Rate, Increase (Decrease) 1.00%us-gaap_DebtInstrumentInterestRateIncreaseDecrease      
Forgivable Promissory Note Repayment Period 5 years      
Senior Notes [Member]        
Debt Instrument Additional Information        
Long-Term Debt 750,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
  750,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
 
Long-Term Debt, by Maturity        
Aggregate principal amount       750,000,000.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Number of Long-term debt tranches       3dltr_NumberofLongtermdebttranches
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Unsecured Debt [Member]        
Debt Instrument Additional Information        
Long-Term Debt 0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
  0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
 
Long-Term Debt, by Maturity        
Revolving line of credit capacity 750,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
     
Unsecured Credit Agreement maturity period 5 years      
Interest rate terms LIBOR, plus 0.90%      
Interest rate 1.06%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
     
Borrowing capacity 750,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
     
Demand Revenue Bonds [Member]        
Debt Instrument Additional Information        
Long-Term Debt 0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= dltr_DemandRevenueBondsMember
  12,800,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= dltr_DemandRevenueBondsMember
 
Long-Term Debt, by Maturity        
Aggregate principal amount 19,000,000.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= dltr_DemandRevenueBondsMember
     
Interest rate 0.19%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= dltr_DemandRevenueBondsMember
     
Forgivable Loan [Member]        
Debt Instrument Additional Information        
Long-Term Debt 7,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= dltr_ForgivableLoanMember
  7,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= dltr_ForgivableLoanMember
 
Long-Term Debt, by Maturity        
Interest rate 1.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= dltr_ForgivableLoanMember
     
Line of Credit [Member]        
Long-Term Debt, by Maturity        
Revolving line of credit capacity 750,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Available letter of credit capacity 150,000,000.0dltr_LetterOfCreditFacilityIssuanceCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
September 16, 2020 [Member] | Senior Notes [Member]        
Long-Term Debt, by Maturity        
Borrowing capacity       300,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dltr_LongTermDebtMaturityAxis
= dltr_September162020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Debt Instrument, Interest Rate, Stated Percentage       4.03%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dltr_LongTermDebtMaturityAxis
= dltr_September162020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
September 16, 2023 [Member] | Senior Notes [Member]        
Long-Term Debt, by Maturity        
Borrowing capacity       350,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dltr_LongTermDebtMaturityAxis
= dltr_September162023Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Debt Instrument, Interest Rate, Stated Percentage       4.63%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dltr_LongTermDebtMaturityAxis
= dltr_September162023Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
September 16, 2025 [Member] | Senior Notes [Member]        
Long-Term Debt, by Maturity        
Borrowing capacity       100,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dltr_LongTermDebtMaturityAxis
= dltr_September162025Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Debt Instrument, Interest Rate, Stated Percentage       4.78%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dltr_LongTermDebtMaturityAxis
= dltr_September162025Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember