Quarterly report pursuant to Section 13 or 15(d)

FUEL DERIVATIVE CONTRACTS Fair value Fuel Derivative Contracts (Details)

v2.4.1.9
FUEL DERIVATIVE CONTRACTS Fair value Fuel Derivative Contracts (Details) (Commodity Contract 1 [Member])
May 02, 2015
gal
Commodity Contract 1 [Member]
 
Derivative [Line Items]  
Nonmonetary notional amount (gallons of diesel) 5,000,000invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= dltr_CommodityContract1Member
Diesel fuel need in derivative contracts (in hundredths) 40.00%us-gaap_DerivativeNonmonetaryNotionalAmountPercentOfRequiredNeedCoverage
/ us-gaap_DerivativeByNatureAxis
= dltr_CommodityContract1Member