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Note L - Share-based Employee Compensation (Details) - Summary of Restricted Stock Activity (USD $)
In Thousands, except Per Share data, unless otherwise specified
6 Months Ended
Dec. 02, 2014
Jun. 02, 2014
Restricted Stock, Performance-based [Member]    
Note L - Share-based Employee Compensation (Details) - Summary of Restricted Stock Activity [Line Items]    
Unvested at June 3, 2014   68us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= rt_RestrictedStockPerformancebasedMember
Unvested at June 3, 2014   $ 7.81us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= rt_RestrictedStockPerformancebasedMember
Unvested at September 2, 2014 68us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= rt_RestrictedStockPerformancebasedMember
68us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= rt_RestrictedStockPerformancebasedMember
Unvested at September 2, 2014 $ 7.81us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= rt_RestrictedStockPerformancebasedMember
$ 7.81us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= rt_RestrictedStockPerformancebasedMember
Restricted Stock, Service-based [Member]    
Note L - Share-based Employee Compensation (Details) - Summary of Restricted Stock Activity [Line Items]    
Unvested at June 3, 2014   1,008us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= rt_RestrictedStockServicebasedMember
Unvested at June 3, 2014   $ 8.11us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= rt_RestrictedStockServicebasedMember
Granted 603us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= rt_RestrictedStockServicebasedMember
 
Granted $ 6.01us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= rt_RestrictedStockServicebasedMember
 
Vested (204)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= rt_RestrictedStockServicebasedMember
 
Vested $ 7.78us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= rt_RestrictedStockServicebasedMember
 
Forfeited (3)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= rt_RestrictedStockServicebasedMember
 
Forfeited $ 7.51us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= rt_RestrictedStockServicebasedMember
 
Unvested at September 2, 2014 1,404us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= rt_RestrictedStockServicebasedMember
1,008us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= rt_RestrictedStockServicebasedMember
Unvested at September 2, 2014 $ 7.26us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= rt_RestrictedStockServicebasedMember
$ 8.11us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= rt_RestrictedStockServicebasedMember