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Segment reporting (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
May 01, 2015
segment
May 02, 2014
segment
Segment reporting    
Number of reportable segments 1us-gaap_NumberOfReportableSegments 1us-gaap_NumberOfReportableSegments
Net sales data for classes of similar products    
Net sales $ 4,918,672us-gaap_SalesRevenueGoodsNet $ 4,522,081us-gaap_SalesRevenueGoodsNet
Consumables    
Net sales data for classes of similar products    
Net sales 3,753,978us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= dg_ConsumablesMember		 3,445,465us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= dg_ConsumablesMember
Seasonal    
Net sales data for classes of similar products    
Net sales 586,293us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= dg_SeasonalMember		 541,432us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= dg_SeasonalMember
Home products    
Net sales data for classes of similar products    
Net sales 303,024us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= dg_HomeProductsMember		 283,597us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= dg_HomeProductsMember
Apparel    
Net sales data for classes of similar products    
Net sales $ 275,377us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= dg_ApparelMember		 $ 251,587us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= dg_ApparelMember