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Summary Of Significant Accounting Policies (Schedule Of Sales Mix) (Details)
3 Months Ended
May 02, 2015
May 03, 2014
Sales Mix [Line Items]    
Company's sales mix as a percent of total sales 100.00%rost_CompanysSalesMixAsPercentOfTotalSales 100.00%rost_CompanysSalesMixAsPercentOfTotalSales
Ladies [Member]    
Sales Mix [Line Items]    
Company's sales mix as a percent of total sales 30.00%rost_CompanysSalesMixAsPercentOfTotalSales
/ us-gaap_ProductOrServiceAxis
= rost_LadiesMember
31.00%rost_CompanysSalesMixAsPercentOfTotalSales
/ us-gaap_ProductOrServiceAxis
= rost_LadiesMember
Home accents and bed and bath [Member]    
Sales Mix [Line Items]    
Company's sales mix as a percent of total sales 23.00%rost_CompanysSalesMixAsPercentOfTotalSales
/ us-gaap_ProductOrServiceAxis
= rost_HomeAccentsAndBedAndBathMember
23.00%rost_CompanysSalesMixAsPercentOfTotalSales
/ us-gaap_ProductOrServiceAxis
= rost_HomeAccentsAndBedAndBathMember
Shoes [Member]    
Sales Mix [Line Items]    
Company's sales mix as a percent of total sales 14.00%rost_CompanysSalesMixAsPercentOfTotalSales
/ us-gaap_ProductOrServiceAxis
= rost_ShoesMember
13.00%rost_CompanysSalesMixAsPercentOfTotalSales
/ us-gaap_ProductOrServiceAxis
= rost_ShoesMember
Accessories, lingerie, fine jewelry, and fragrances [Member]    
Sales Mix [Line Items]    
Company's sales mix as a percent of total sales 13.00%rost_CompanysSalesMixAsPercentOfTotalSales
/ us-gaap_ProductOrServiceAxis
= rost_AccessoriesLingerieFineJewelryAndFragrancesMember
13.00%rost_CompanysSalesMixAsPercentOfTotalSales
/ us-gaap_ProductOrServiceAxis
= rost_AccessoriesLingerieFineJewelryAndFragrancesMember
Men's [Member]    
Sales Mix [Line Items]    
Company's sales mix as a percent of total sales 12.00%rost_CompanysSalesMixAsPercentOfTotalSales
/ us-gaap_ProductOrServiceAxis
= rost_MenSMember
12.00%rost_CompanysSalesMixAsPercentOfTotalSales
/ us-gaap_ProductOrServiceAxis
= rost_MenSMember
Children's [Member]    
Sales Mix [Line Items]    
Company's sales mix as a percent of total sales 8.00%rost_CompanysSalesMixAsPercentOfTotalSales
/ us-gaap_ProductOrServiceAxis
= rost_ChildrenSMember
8.00%rost_CompanysSalesMixAsPercentOfTotalSales
/ us-gaap_ProductOrServiceAxis
= rost_ChildrenSMember