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Stock-Based Compensation (Summary Of Weighted Average Remaining Contractual Life And The Weighted Average Exercise Prices For Stock Options Both Outstanding And Exercisable) (Details) (Stock Options [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
May 02, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options outstanding and exercisable, Number of shares 260rost_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAndExercisableNumber
Options outstanding and exercisable, Remaining life 1 year 0 months 0 days
Options outstanding and exercisable, Exercise price (in dollars per share) $ 14.28rost_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAndExercisableWeightedAverageExercisePrice
Exercise price range, lower range limit (in dollars per share) $ 11.47us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
Exercise price range, upper range limit (in dollars per share) $ 16.39us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
$11.47 - $13.77 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options outstanding and exercisable, Number of shares 69rost_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAndExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rost_RangeOneMember
Options outstanding and exercisable, Remaining life 0 years 9 months 18 days
Options outstanding and exercisable, Exercise price (in dollars per share) $ 13.31rost_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAndExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rost_RangeOneMember
Exercise price range, lower range limit (in dollars per share) $ 11.47us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rost_RangeOneMember
Exercise price range, upper range limit (in dollars per share) $ 13.77us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rost_RangeOneMember
$13.85 - $13.85 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options outstanding and exercisable, Number of shares 18rost_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAndExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rost_RangeTwoMember
Options outstanding and exercisable, Remaining life 0 years 0 months 18 days
Options outstanding and exercisable, Exercise price (in dollars per share) $ 13.85rost_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAndExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rost_RangeTwoMember
Exercise price range, lower range limit (in dollars per share) $ 13.85us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rost_RangeTwoMember
Exercise price range, upper range limit (in dollars per share) $ 13.85us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rost_RangeTwoMember
$13.91 - $13.91 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options outstanding and exercisable, Number of shares 85rost_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAndExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rost_RangeThreeMember
Options outstanding and exercisable, Remaining life 0 years 10 months 9 days
Options outstanding and exercisable, Exercise price (in dollars per share) $ 13.91rost_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAndExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rost_RangeThreeMember
Exercise price range, lower range limit (in dollars per share) $ 13.91us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rost_RangeThreeMember
Exercise price range, upper range limit (in dollars per share) $ 13.91us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rost_RangeThreeMember
$13.92 - $16.39 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options outstanding and exercisable, Number of shares 88rost_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAndExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rost_RangeFourMember
Options outstanding and exercisable, Remaining life 1 year 5 months 26 days
Options outstanding and exercisable, Exercise price (in dollars per share) $ 15.52rost_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAndExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rost_RangeFourMember
Exercise price range, lower range limit (in dollars per share) $ 13.92us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rost_RangeFourMember
Exercise price range, upper range limit (in dollars per share) $ 16.39us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rost_RangeFourMember