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Summary Of Significant Accounting Policies (Schedule Of Sales Mix) (Details)
12 Months Ended
Jan. 31, 2015
Feb. 01, 2014
Feb. 02, 2013
Sales Mix [Line Items]      
Company's sales mix as a percent of total sales 100.00%rost_CompanysSalesMixAsPercentOfTotalSales 100.00%rost_CompanysSalesMixAsPercentOfTotalSales 100.00%rost_CompanysSalesMixAsPercentOfTotalSales
Ladies [Member]      
Sales Mix [Line Items]      
Company's sales mix as a percent of total sales 29.00%rost_CompanysSalesMixAsPercentOfTotalSales
/ us-gaap_ProductOrServiceAxis
= rost_LadiesMember
29.00%rost_CompanysSalesMixAsPercentOfTotalSales
/ us-gaap_ProductOrServiceAxis
= rost_LadiesMember
29.00%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 24.00%rost_CompanysSalesMixAsPercentOfTotalSales
/ us-gaap_ProductOrServiceAxis
= rost_HomeAccentsAndBedAndBathMember
24.00%rost_CompanysSalesMixAsPercentOfTotalSales
/ us-gaap_ProductOrServiceAxis
= rost_HomeAccentsAndBedAndBathMember
24.00%rost_CompanysSalesMixAsPercentOfTotalSales
/ us-gaap_ProductOrServiceAxis
= rost_HomeAccentsAndBedAndBathMember
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
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 13.00%rost_CompanysSalesMixAsPercentOfTotalSales
/ us-gaap_ProductOrServiceAxis
= rost_MenSMember
13.00%rost_CompanysSalesMixAsPercentOfTotalSales
/ us-gaap_ProductOrServiceAxis
= rost_MenSMember
13.00%rost_CompanysSalesMixAsPercentOfTotalSales
/ us-gaap_ProductOrServiceAxis
= rost_MenSMember
Shoes [Member]      
Sales Mix [Line Items]      
Company's sales mix as a percent of total sales 13.00%rost_CompanysSalesMixAsPercentOfTotalSales
/ us-gaap_ProductOrServiceAxis
= rost_ShoesMember
13.00%rost_CompanysSalesMixAsPercentOfTotalSales
/ us-gaap_ProductOrServiceAxis
= rost_ShoesMember
13.00%rost_CompanysSalesMixAsPercentOfTotalSales
/ us-gaap_ProductOrServiceAxis
= rost_ShoesMember
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
8.00%rost_CompanysSalesMixAsPercentOfTotalSales
/ us-gaap_ProductOrServiceAxis
= rost_ChildrenSMember