Annual report pursuant to Section 13 and 15(d)

QUARTERLY FINANCIAL INFORMATION (Details)

v2.4.1.9
QUARTERLY FINANCIAL INFORMATION (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Jan. 31, 2015
store
Nov. 01, 2014
store
Aug. 02, 2014
store
May 03, 2014
store
Feb. 01, 2014
store
Nov. 02, 2013
store
Aug. 03, 2013
store
May 04, 2013
store
Jan. 31, 2015
store
Feb. 01, 2014
store
Feb. 02, 2013
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 2,475.6us-gaap_SalesRevenueGoodsNet $ 2,095.2us-gaap_SalesRevenueGoodsNet $ 2,031.1us-gaap_SalesRevenueGoodsNet $ 2,000.3us-gaap_SalesRevenueGoodsNet [1] $ 2,234.9us-gaap_SalesRevenueGoodsNet $ 1,884.7us-gaap_SalesRevenueGoodsNet $ 1,854.9us-gaap_SalesRevenueGoodsNet $ 1,865.8us-gaap_SalesRevenueGoodsNet [1] $ 8,602.2us-gaap_SalesRevenueGoodsNet $ 7,840.3us-gaap_SalesRevenueGoodsNet $ 7,394.5us-gaap_SalesRevenueGoodsNet
Gross profit 918.1us-gaap_GrossProfit 725.3us-gaap_GrossProfit 694.1us-gaap_GrossProfit 696.6us-gaap_GrossProfit [1] 825.2us-gaap_GrossProfit 659.9us-gaap_GrossProfit 648.7us-gaap_GrossProfit 656.0us-gaap_GrossProfit [1] 3,034.0us-gaap_GrossProfit 2,789.8us-gaap_GrossProfit 2,652.7us-gaap_GrossProfit
Operating income 383.6us-gaap_OperatingIncomeLoss 219.7us-gaap_OperatingIncomeLoss 205.0us-gaap_OperatingIncomeLoss 231.9us-gaap_OperatingIncomeLoss [1] 348.2us-gaap_OperatingIncomeLoss 204.3us-gaap_OperatingIncomeLoss 201.3us-gaap_OperatingIncomeLoss 216.6us-gaap_OperatingIncomeLoss [1] 1,040.2us-gaap_OperatingIncomeLoss 970.3us-gaap_OperatingIncomeLoss 920.1us-gaap_OperatingIncomeLoss
Net income $ 206.6us-gaap_NetIncomeLoss $ 133.0us-gaap_NetIncomeLoss $ 121.5us-gaap_NetIncomeLoss $ 138.3us-gaap_NetIncomeLoss [1] $ 213.0us-gaap_NetIncomeLoss $ 125.4us-gaap_NetIncomeLoss $ 124.7us-gaap_NetIncomeLoss $ 133.5us-gaap_NetIncomeLoss [1] $ 599.2us-gaap_NetIncomeLoss $ 596.7us-gaap_NetIncomeLoss $ 619.3us-gaap_NetIncomeLoss
Diluted net income per share (usd per share) $ 1.00us-gaap_EarningsPerShareDiluted $ 0.64us-gaap_EarningsPerShareDiluted $ 0.59us-gaap_EarningsPerShareDiluted $ 0.67us-gaap_EarningsPerShareDiluted [1] $ 1.02us-gaap_EarningsPerShareDiluted $ 0.58us-gaap_EarningsPerShareDiluted $ 0.56us-gaap_EarningsPerShareDiluted $ 0.59us-gaap_EarningsPerShareDiluted [1] $ 2.90us-gaap_EarningsPerShareDiluted $ 2.72us-gaap_EarningsPerShareDiluted $ 2.68us-gaap_EarningsPerShareDiluted
Stores open at end of quarter 5,367us-gaap_NumberOfStores 5,282us-gaap_NumberOfStores 5,166us-gaap_NumberOfStores 5,080us-gaap_NumberOfStores [1] 4,992us-gaap_NumberOfStores 4,953us-gaap_NumberOfStores 4,842us-gaap_NumberOfStores 4,763us-gaap_NumberOfStores [1] 5,367us-gaap_NumberOfStores 4,992us-gaap_NumberOfStores  
Comparable store net sales change (in hundredths) 5.50%dltr_ComparableNetSalesChange 5.90%dltr_ComparableNetSalesChange 4.40%dltr_ComparableNetSalesChange 1.90%dltr_ComparableNetSalesChange [1] 1.20%dltr_ComparableNetSalesChange 3.10%dltr_ComparableNetSalesChange 3.70%dltr_ComparableNetSalesChange 2.10%dltr_ComparableNetSalesChange [1]      
[1] Easter was observed on April 20, 2014 and March 31, 2013.