Quarterly report pursuant to Section 13 or 15(d)

LONG-TERM DEBT AND RESTRICTED CASH (Details)

v2.4.1.9
LONG-TERM DEBT AND RESTRICTED CASH (Details) (USD $)
 0 Months Ended 3 Months Ended
Feb. 24, 2015
May 02, 2015
Jan. 31, 2015
Feb. 23, 2015
Mar. 09, 2015
Debt Instrument [Line Items]          
Long-term Debt   7,957,000,000us-gaap_LongTermDebt $ 757,000,000us-gaap_LongTermDebt    
Unamortized Discount and Debt Issuance Costs   137,300,000dltr_UnamortizedDiscountandDebtIssuanceCosts 74,300,000dltr_UnamortizedDiscountandDebtIssuanceCosts    
Debt Instrument, Redemption Price, Percentage 100.00%us-gaap_DebtInstrumentRedemptionPricePercentage        
2020 Senior Notes [Member]          
Debt Instrument [Line Items]          
Long-term Debt   750,000,000us-gaap_LongTermDebt
/ dltr_SeniorNotesAxis
= dltr_A2020SeniorNotesMember 		0us-gaap_LongTermDebt
/ dltr_SeniorNotesAxis
= dltr_A2020SeniorNotesMember 		   
Unamortized Discount and Debt Issuance Costs   12,400,000dltr_UnamortizedDiscountandDebtIssuanceCosts
/ dltr_SeniorNotesAxis
= dltr_A2020SeniorNotesMember 		11,900,000dltr_UnamortizedDiscountandDebtIssuanceCosts
/ dltr_SeniorNotesAxis
= dltr_A2020SeniorNotesMember 		   
Debt Instrument, Interest Rate, Stated Percentage       5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dltr_SeniorNotesAxis
= dltr_A2020SeniorNotesMember 		 
Debt Instrument, Interest Rate, Effective Percentage   5.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ dltr_SeniorNotesAxis
= dltr_A2020SeniorNotesMember 		     
Senior Notes       750,000,000us-gaap_SeniorNotes
/ dltr_SeniorNotesAxis
= dltr_A2020SeniorNotesMember 		 
2023 Senior Notes [Member]          
Debt Instrument [Line Items]          
Long-term Debt   2,500,000,000us-gaap_LongTermDebt
/ dltr_SeniorNotesAxis
= dltr_A2023SeniorNotesMember 		0us-gaap_LongTermDebt
/ dltr_SeniorNotesAxis
= dltr_A2023SeniorNotesMember 		   
Unamortized Discount and Debt Issuance Costs   41,800,000dltr_UnamortizedDiscountandDebtIssuanceCosts
/ dltr_SeniorNotesAxis
= dltr_A2023SeniorNotesMember 		39,800,000dltr_UnamortizedDiscountandDebtIssuanceCosts
/ dltr_SeniorNotesAxis
= dltr_A2023SeniorNotesMember 		   
Debt Instrument, Interest Rate, Stated Percentage       5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dltr_SeniorNotesAxis
= dltr_A2023SeniorNotesMember 		 
Debt Instrument, Interest Rate, Effective Percentage   5.75%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ dltr_SeniorNotesAxis
= dltr_A2023SeniorNotesMember 		     
Senior Notes       2,500,000,000us-gaap_SeniorNotes
/ dltr_SeniorNotesAxis
= dltr_A2023SeniorNotesMember 		 
Senior Secured Credit Facilities [Member]          
Debt Instrument [Line Items]          
Long-term Debt   0us-gaap_LongTermDebt
/ dltr_TermLoanAxis
= dltr_SeniorSecuredCreditFacilitiesMember 		0us-gaap_LongTermDebt
/ dltr_TermLoanAxis
= dltr_SeniorSecuredCreditFacilitiesMember 		   
Unamortized Discount and Debt Issuance Costs   11,400,000dltr_UnamortizedDiscountandDebtIssuanceCosts
/ dltr_TermLoanAxis
= dltr_SeniorSecuredCreditFacilitiesMember 		9,800,000dltr_UnamortizedDiscountandDebtIssuanceCosts
/ dltr_TermLoanAxis
= dltr_SeniorSecuredCreditFacilitiesMember 		   
Debt Instrument, Interest Rate, Stated Percentage         2.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dltr_TermLoanAxis
= dltr_SeniorSecuredCreditFacilitiesMember
Senior Secured Credit Facilities         6,200,000,000dltr_SeniorSecuredCreditFacilities
/ dltr_TermLoanAxis
= dltr_SeniorSecuredCreditFacilitiesMember
Base Rate plus Interest per Annum         1.25%dltr_BaseRateplusInterestperAnnum
/ dltr_TermLoanAxis
= dltr_SeniorSecuredCreditFacilitiesMember
Debt Instrument, Interest Rate, Effective Percentage   2.43%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ dltr_TermLoanAxis
= dltr_SeniorSecuredCreditFacilitiesMember 		     
Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Senior Secured Credit Facilities         1,250,000,000dltr_SeniorSecuredCreditFacilities
/ dltr_TermLoanAxis
= us-gaap_RevolvingCreditFacilityMember
Term Loan Facilities [Member]          
Debt Instrument [Line Items]          
Senior Secured Credit Facilities         4,950,000,000dltr_SeniorSecuredCreditFacilities
/ dltr_TermLoanAxis
= dltr_TermLoanFacilitiesMember
Term Loan A [Member]          
Debt Instrument [Line Items]          
Long-term Debt   0us-gaap_LongTermDebt
/ dltr_TermLoanAxis
= dltr_TermLoanAMember 		0us-gaap_LongTermDebt
/ dltr_TermLoanAxis
= dltr_TermLoanAMember 		   
Unamortized Discount and Debt Issuance Costs   400,000dltr_UnamortizedDiscountandDebtIssuanceCosts
/ dltr_TermLoanAxis
= dltr_TermLoanAMember 		400,000dltr_UnamortizedDiscountandDebtIssuanceCosts
/ dltr_TermLoanAxis
= dltr_TermLoanAMember 		   
Senior Secured Credit Facilities         1,000,000,000dltr_SeniorSecuredCreditFacilities
/ dltr_TermLoanAxis
= dltr_TermLoanAMember
Debt Instrument, Interest Rate, Effective Percentage   2.43%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ dltr_TermLoanAxis
= dltr_TermLoanAMember 		     
Quarterly Amortization Payments Percentage of Original Principal Amount Year One         1.25%dltr_QuarterlyAmortizationPaymentsPercentageofOriginalPrincipalAmountYearOne
/ dltr_TermLoanAxis
= dltr_TermLoanAMember
Quarterly Amortization Payments Percentage of Original Principal Amount Year Two         2.50%dltr_QuarterlyAmortizationPaymentsPercentageofOriginalPrincipalAmountYearTwo
/ dltr_TermLoanAxis
= dltr_TermLoanAMember
Quarterly Amortization Payments Percentage of Original Principal Amount Beyond Year Two         3.80%dltr_QuarterlyAmortizationPaymentsPercentageofOriginalPrincipalAmountBeyondYearTwo
/ dltr_TermLoanAxis
= dltr_TermLoanAMember
Term Loan B [Member]          
Debt Instrument [Line Items]          
Long-term Debt   3,950,000,000us-gaap_LongTermDebt
/ dltr_TermLoanAxis
= dltr_TermLoanBMember 		0us-gaap_LongTermDebt
/ dltr_TermLoanAxis
= dltr_TermLoanBMember 		   
Unamortized Discount and Debt Issuance Costs   67,300,000dltr_UnamortizedDiscountandDebtIssuanceCosts
/ dltr_TermLoanAxis
= dltr_TermLoanBMember 		8,200,000dltr_UnamortizedDiscountandDebtIssuanceCosts
/ dltr_TermLoanAxis
= dltr_TermLoanBMember 		   
Debt Instrument, Interest Rate, Stated Percentage         3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dltr_TermLoanAxis
= dltr_TermLoanBMember
Senior Secured Credit Facilities         3,950,000,000dltr_SeniorSecuredCreditFacilities
/ dltr_TermLoanAxis
= dltr_TermLoanBMember
Base Rate plus Interest per Annum         2.50%dltr_BaseRateplusInterestperAnnum
/ dltr_TermLoanAxis
= dltr_TermLoanBMember
Debt Instrument, Interest Rate, Effective Percentage   4.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ dltr_TermLoanAxis
= dltr_TermLoanBMember 		     
Discount based on imputed interest rate   4.50%dltr_Discountbasedonimputedinterestrate
/ dltr_TermLoanAxis
= dltr_TermLoanBMember 		     
LIBOR Floor Percentage Rate   0.75%dltr_LIBORFloorPercentageRate
/ dltr_TermLoanAxis
= dltr_TermLoanBMember 		    0.75%dltr_LIBORFloorPercentageRate
/ dltr_TermLoanAxis
= dltr_TermLoanBMember
Quarterly Amortization Payments of Original Principal Amount after Closing         0.25%dltr_QuarterlyAmortizationPaymentsofOriginalPrincipalAmountafterClosing
/ dltr_TermLoanAxis
= dltr_TermLoanBMember
Prepayment fee if Loans Subject to Certain Repricing Transactions         1.00%dltr_PrepaymentfeeifLoansSubjecttoCertainRepricingTransactions
/ dltr_TermLoanAxis
= dltr_TermLoanBMember
Unsecured Debt [Member]          
Debt Instrument [Line Items]          
Long-term Debt   0us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= us-gaap_UnsecuredDebtMember 		0us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= us-gaap_UnsecuredDebtMember 		   
Unamortized Discount and Debt Issuance Costs   700,000dltr_UnamortizedDiscountandDebtIssuanceCosts
/ us-gaap_CreditFacilityAxis
= us-gaap_UnsecuredDebtMember 		900,000dltr_UnamortizedDiscountandDebtIssuanceCosts
/ us-gaap_CreditFacilityAxis
= us-gaap_UnsecuredDebtMember 		   
Debt Instrument, Interest Rate, Effective Percentage   1.08%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_UnsecuredDebtMember 		     
Senior Notes [Member]          
Debt Instrument [Line Items]          
Long-term Debt   750,000,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember 		750,000,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember 		   
Unamortized Discount and Debt Issuance Costs   3,300,000dltr_UnamortizedDiscountandDebtIssuanceCosts
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember 		3,300,000dltr_UnamortizedDiscountandDebtIssuanceCosts
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember 		   
FORGIVABLE PROMISSORY NOTES [Domain]          
Debt Instrument [Line Items]          
Long-term Debt   7,000,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= dltr_FORGIVABLEPROMISSORYNOTESDomain 		7,000,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= dltr_FORGIVABLEPROMISSORYNOTESDomain 		   
Unamortized Discount and Debt Issuance Costs   0dltr_UnamortizedDiscountandDebtIssuanceCosts
/ us-gaap_LongtermDebtTypeAxis
= dltr_FORGIVABLEPROMISSORYNOTESDomain 		$ 0dltr_UnamortizedDiscountandDebtIssuanceCosts
/ us-gaap_LongtermDebtTypeAxis
= dltr_FORGIVABLEPROMISSORYNOTESDomain 		   
Debt Instrument, Interest Rate, Effective Percentage   1.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= dltr_FORGIVABLEPROMISSORYNOTESDomain 		     
LIBOR [Member] | Senior Secured Credit Facilities [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Basis Spread on Variable Rate   2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ dltr_TermLoanAxis
= dltr_SeniorSecuredCreditFacilitiesMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember 		     
LIBOR [Member] | Term Loan A [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Basis Spread on Variable Rate   2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ dltr_TermLoanAxis
= dltr_TermLoanAMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember 		     
LIBOR [Member] | Term Loan B [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Basis Spread on Variable Rate   3.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ dltr_TermLoanAxis
= dltr_TermLoanBMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember 		     
LIBOR [Member] | Unsecured Debt [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Basis Spread on Variable Rate   0.90%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_UnsecuredDebtMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember