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Related Party Transactions (Details) (USD $)
12 Months Ended
Jan. 31, 2015
Feb. 01, 2014
Feb. 02, 2013
Related Party Transaction, Due from (to) Related Party [Abstract]      
Chairman Emeritus of the Board of Directors, consulting fee $ 1,500,000rost_ChairmanEmeritusOfTheBoardOfDirectorsConsultingFee    
Chairman Emeritus of the Board of Directors, administrative support, health, other benefits 300,000rost_ChairmanEmeritusOfTheBoardOfDirectorsAdministrativeSupportHealthOtherBenefits 300,000rost_ChairmanEmeritusOfTheBoardOfDirectorsAdministrativeSupportHealthOtherBenefits 300,000rost_ChairmanEmeritusOfTheBoardOfDirectorsAdministrativeSupportHealthOtherBenefits
Chairman Emeritus of the Board of Directors, life insurance death benefit 2,000,000rost_ChairmanEmeritusoftheBoardofDirectorsLifeInsuranceDeathBenefit    
Chairman Emeritus of the Board of Directors, severance pay 75,000rost_ChairmanEmeritusOfBoardOfDirectorsSeverancePay    
Chairman Emeritus of the Board of Directors, severance term 10 years    
Son of Chairman Emeritus of the Board of Directors, compensation expense $ 133,000rost_RelativeofChairmanEmeritusoftheBoardofDirectorsCompensationExpense