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Note P – Supplemental Condensed Consolidating Financial Statements (Details) - Condensed Consolidating Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 03, 2015
Jun. 03, 2014
Mar. 04, 2014
Jun. 04, 2013
Current assets:        
Cash and cash equivalents, Parent $ 61,221us-gaap_CashAndCashEquivalentsAtCarryingValue $ 51,326us-gaap_CashAndCashEquivalentsAtCarryingValue $ 44,474us-gaap_CashAndCashEquivalentsAtCarryingValue $ 52,907us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents 61,221us-gaap_CashAndCashEquivalentsAtCarryingValue 51,326us-gaap_CashAndCashEquivalentsAtCarryingValue 44,474us-gaap_CashAndCashEquivalentsAtCarryingValue 52,907us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, Parent 4,850us-gaap_AccountsNotesAndLoansReceivableNetCurrent 4,861us-gaap_AccountsNotesAndLoansReceivableNetCurrent    
Accounts receivable 4,850us-gaap_AccountsNotesAndLoansReceivableNetCurrent 4,861us-gaap_AccountsNotesAndLoansReceivableNetCurrent    
Inventories, Parent 22,944us-gaap_InventoryNet 21,174us-gaap_InventoryNet    
Inventories 22,944us-gaap_InventoryNet 21,174us-gaap_InventoryNet    
Income tax receivable, Parent 2,366us-gaap_IncomeTaxesReceivable 2,133us-gaap_IncomeTaxesReceivable    
Income tax receivable 2,366us-gaap_IncomeTaxesReceivable 2,133us-gaap_IncomeTaxesReceivable    
Deferred income taxes 361us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 3,397us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent    
Other current assets, Parent 17,875us-gaap_OtherAssetsCurrent 16,899us-gaap_OtherAssetsCurrent    
Other current assets 17,875us-gaap_OtherAssetsCurrent 16,899us-gaap_OtherAssetsCurrent    
Total current assets, Parent 109,617us-gaap_AssetsCurrent 99,790us-gaap_AssetsCurrent    
Total current assets 109,617us-gaap_AssetsCurrent 99,790us-gaap_AssetsCurrent    
Property and equipment, net, Parent 761,800us-gaap_PropertyPlantAndEquipmentNet 794,846us-gaap_PropertyPlantAndEquipmentNet    
Property and equipment, net 761,800us-gaap_PropertyPlantAndEquipmentNet 794,846us-gaap_PropertyPlantAndEquipmentNet    
Other assets, Parent 58,470us-gaap_OtherAssetsNoncurrent 61,791us-gaap_OtherAssetsNoncurrent    
Other assets 58,470us-gaap_OtherAssets 61,791us-gaap_OtherAssets    
Total assets, Parent 929,887us-gaap_Assets 956,427us-gaap_Assets    
Total assets 929,887us-gaap_Assets 956,427us-gaap_Assets    
Current liabilities:        
Accounts payable, Parent 20,836us-gaap_AccountsPayableCurrent 26,201us-gaap_AccountsPayableCurrent    
Accounts payable 20,836us-gaap_AccountsPayableCurrent 26,201us-gaap_AccountsPayableCurrent    
Accrued and other current liabilities, Parent 79,484us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent 82,806us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent    
Accrued and other current liabilities 79,484us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent 82,806us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent    
Current maturities of long-term debt, including capital leases, Parent 4,558us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent 4,816us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent    
Current maturities of long-term debt, including capital leases 4,558us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent 4,816us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent    
Total current liabilities, Parent 104,878us-gaap_LiabilitiesCurrent 113,823us-gaap_LiabilitiesCurrent    
Total current liabilities 104,878us-gaap_LiabilitiesCurrent 113,823us-gaap_LiabilitiesCurrent    
Long-term debt and capital leases, less current maturities, Parent 246,751us-gaap_LongTermDebtAndCapitalLeaseObligations 253,875us-gaap_LongTermDebtAndCapitalLeaseObligations    
Long-term debt and capital leases, less current maturities 246,751us-gaap_LongTermDebtAndCapitalLeaseObligations 253,875us-gaap_LongTermDebtAndCapitalLeaseObligations    
Deferred income taxes 2,770us-gaap_DeferredTaxLiabilitiesNoncurrent 3,500us-gaap_DeferredTaxLiabilitiesNoncurrent    
Other deferred liabilities, Parent 114,590rt_OtherDeferredLiabilitiesAndDeferredEscalatingMinimumRent 124,020rt_OtherDeferredLiabilitiesAndDeferredEscalatingMinimumRent    
Other deferred liabilities 114,590rt_OtherDeferredLiabilitiesAndDeferredEscalatingMinimumRent 124,020rt_OtherDeferredLiabilitiesAndDeferredEscalatingMinimumRent    
Total liabilities, Parent 468,989us-gaap_Liabilities 495,218us-gaap_Liabilities    
Total liabilities 468,989us-gaap_Liabilities 495,218us-gaap_Liabilities    
Shareholders’ equity:        
Common stock, Parent 621us-gaap_CommonStockValue 614us-gaap_CommonStockValue    
Common stock 621us-gaap_CommonStockValue 614us-gaap_CommonStockValue    
Capital in excess of par value, Parent 82,038us-gaap_AdditionalPaidInCapitalCommonStock 76,269us-gaap_AdditionalPaidInCapitalCommonStock    
Capital in excess of par value 82,038us-gaap_AdditionalPaidInCapitalCommonStock 76,269us-gaap_AdditionalPaidInCapitalCommonStock    
Retained earnings, Parent 387,749us-gaap_RetainedEarningsAccumulatedDeficit 395,226us-gaap_RetainedEarningsAccumulatedDeficit    
Retained earnings 387,749us-gaap_RetainedEarningsAccumulatedDeficit 395,226us-gaap_RetainedEarningsAccumulatedDeficit    
Accumulated other comprehensive loss, Parent (9,510)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (10,900)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax    
Accumulated other comprehensive loss (9,510)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (10,900)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax    
Total shareholders’ equity, Parent 460,898us-gaap_StockholdersEquity 461,209us-gaap_StockholdersEquity    
Total shareholders’ equity 460,898us-gaap_StockholdersEquity 461,209us-gaap_StockholdersEquity    
Total liabilities & shareholders’ equity, Parent 929,887us-gaap_LiabilitiesAndStockholdersEquity 956,427us-gaap_LiabilitiesAndStockholdersEquity    
Total liabilities & shareholders’ equity 929,887us-gaap_LiabilitiesAndStockholdersEquity 956,427us-gaap_LiabilitiesAndStockholdersEquity    
Consolidation, Eliminations [Member]        
Current assets:        
Cash and cash equivalents, Parent 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
     
Cash and cash equivalents 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
     
Income tax receivable, Parent (147,749)us-gaap_IncomeTaxesReceivable
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(136,391)us-gaap_IncomeTaxesReceivable
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Income tax receivable (147,749)us-gaap_IncomeTaxesReceivable
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(136,391)us-gaap_IncomeTaxesReceivable
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total current assets, Parent (147,749)us-gaap_AssetsCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(136,391)us-gaap_AssetsCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total current assets (147,749)us-gaap_AssetsCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(136,391)us-gaap_AssetsCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Investment in subsidiaries, Parent (136,416)us-gaap_DeferredTaxAssetsInvestmentInSubsidiaries
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(158,266)us-gaap_DeferredTaxAssetsInvestmentInSubsidiaries
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Investment in subsidiaries (136,416)us-gaap_DeferredTaxAssetsInvestmentInSubsidiaries
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(158,266)us-gaap_DeferredTaxAssetsInvestmentInSubsidiaries
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Due from/(to) subsidiaries, Parent (291,087)us-gaap_DueFromRelatedPartiesNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(322,277)us-gaap_DueFromRelatedPartiesNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Due from/(to) subsidiaries (291,087)us-gaap_DueFromRelatedPartiesNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(322,277)us-gaap_DueFromRelatedPartiesNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total assets, Parent (575,252)us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(616,934)us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total assets (575,252)us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(616,934)us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Current liabilities:        
Income tax payable, Parent (147,749)us-gaap_AccruedIncomeTaxesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(136,391)us-gaap_AccruedIncomeTaxesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total current liabilities, Parent (147,749)us-gaap_LiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(136,391)us-gaap_LiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total current liabilities (147,749)us-gaap_LiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(136,391)us-gaap_LiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Due to/(from) subsidiaries, Parent (291,087)us-gaap_DueToRelatedPartiesNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(322,277)us-gaap_DueToRelatedPartiesNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Due to/(from) subsidiaries (291,087)us-gaap_DueToRelatedPartiesNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(322,277)us-gaap_DueToRelatedPartiesNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total liabilities, Parent (438,836)us-gaap_Liabilities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(458,668)us-gaap_Liabilities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total liabilities (438,836)us-gaap_Liabilities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(458,668)us-gaap_Liabilities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Shareholders’ equity:        
Retained earnings, Parent (136,416)us-gaap_RetainedEarningsAccumulatedDeficit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(158,266)us-gaap_RetainedEarningsAccumulatedDeficit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Retained earnings (136,416)us-gaap_RetainedEarningsAccumulatedDeficit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(158,266)us-gaap_RetainedEarningsAccumulatedDeficit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total shareholders’ equity, Parent (136,416)us-gaap_StockholdersEquity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(158,266)us-gaap_StockholdersEquity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total shareholders’ equity (136,416)us-gaap_StockholdersEquity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(158,266)us-gaap_StockholdersEquity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total liabilities & shareholders’ equity, Parent (575,252)us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(616,934)us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total liabilities & shareholders’ equity (575,252)us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(616,934)us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Parent Company [Member]        
Current assets:        
Cash and cash equivalents, Parent 60,925us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
51,012us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
44,134us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
52,635us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash and cash equivalents 60,925us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
51,012us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
44,134us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
52,635us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Accounts receivable, Parent 1,934us-gaap_AccountsNotesAndLoansReceivableNetCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,725us-gaap_AccountsNotesAndLoansReceivableNetCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Accounts receivable 1,934us-gaap_AccountsNotesAndLoansReceivableNetCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,725us-gaap_AccountsNotesAndLoansReceivableNetCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Inventories, Parent 16,271us-gaap_InventoryNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
15,114us-gaap_InventoryNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Inventories 16,271us-gaap_InventoryNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
15,114us-gaap_InventoryNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Income tax receivable, Parent 150,115us-gaap_IncomeTaxesReceivable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
138,524us-gaap_IncomeTaxesReceivable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Income tax receivable 150,115us-gaap_IncomeTaxesReceivable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
138,524us-gaap_IncomeTaxesReceivable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Deferred income taxes, Parent (3,038)us-gaap_DeferredTaxLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(548)us-gaap_DeferredTaxLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other current assets, Parent 15,520us-gaap_OtherAssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
14,610us-gaap_OtherAssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other current assets 15,520us-gaap_OtherAssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
14,610us-gaap_OtherAssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total current assets, Parent 241,727us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
220,437us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total current assets 241,727us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
220,437us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Property and equipment, net, Parent 563,153us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
587,783us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Property and equipment, net 563,153us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
587,783us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Investment in subsidiaries, Parent 136,416us-gaap_DeferredTaxAssetsInvestmentInSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
158,266us-gaap_DeferredTaxAssetsInvestmentInSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Investment in subsidiaries 136,416us-gaap_DeferredTaxAssetsInvestmentInSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
158,266us-gaap_DeferredTaxAssetsInvestmentInSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Due from/(to) subsidiaries, Parent 67,992us-gaap_DueFromRelatedPartiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
78,612us-gaap_DueFromRelatedPartiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Due from/(to) subsidiaries 67,992us-gaap_DueFromRelatedPartiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
78,612us-gaap_DueFromRelatedPartiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other assets, Parent 47,094us-gaap_OtherAssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
48,780us-gaap_OtherAssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total assets, Parent 1,056,382us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,093,878us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total assets 1,056,382us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,093,878us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Current liabilities:        
Accounts payable, Parent 17,052us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
20,545us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Accounts payable 17,052us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
20,545us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Accrued and other current liabilities, Parent 43,512us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
46,450us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Accrued and other current liabilities 43,512us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
46,450us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Current maturities of long-term debt, including capital leases, Parent (361)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(341)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Current maturities of long-term debt, including capital leases (361)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(341)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total current liabilities, Parent 60,203us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
66,654us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total current liabilities 60,203us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
66,654us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Long-term debt and capital leases, less current maturities, Parent 213,307us-gaap_LongTermDebtAndCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
213,039us-gaap_LongTermDebtAndCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Long-term debt and capital leases, less current maturities 213,307us-gaap_LongTermDebtAndCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
213,039us-gaap_LongTermDebtAndCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Deferred income taxes, Parent (1,914)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(445)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Due to/(from) subsidiaries, Parent 223,095us-gaap_DueToRelatedPartiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
243,665us-gaap_DueToRelatedPartiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Due to/(from) subsidiaries 223,095us-gaap_DueToRelatedPartiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
243,665us-gaap_DueToRelatedPartiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other deferred liabilities, Parent 100,793rt_OtherDeferredLiabilitiesAndDeferredEscalatingMinimumRent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
109,756rt_OtherDeferredLiabilitiesAndDeferredEscalatingMinimumRent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other deferred liabilities 100,793rt_OtherDeferredLiabilitiesAndDeferredEscalatingMinimumRent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
109,756rt_OtherDeferredLiabilitiesAndDeferredEscalatingMinimumRent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total liabilities, Parent 595,484us-gaap_Liabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
632,669us-gaap_Liabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total liabilities 595,484us-gaap_Liabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
632,669us-gaap_Liabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Shareholders’ equity:        
Common stock, Parent 621us-gaap_CommonStockValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
614us-gaap_CommonStockValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Common stock 621us-gaap_CommonStockValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
614us-gaap_CommonStockValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Capital in excess of par value, Parent 82,038us-gaap_AdditionalPaidInCapitalCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
76,269us-gaap_AdditionalPaidInCapitalCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Capital in excess of par value 82,038us-gaap_AdditionalPaidInCapitalCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
76,269us-gaap_AdditionalPaidInCapitalCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Retained earnings, Parent 387,749us-gaap_RetainedEarningsAccumulatedDeficit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
395,226us-gaap_RetainedEarningsAccumulatedDeficit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Retained earnings 387,749us-gaap_RetainedEarningsAccumulatedDeficit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
395,226us-gaap_RetainedEarningsAccumulatedDeficit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Accumulated other comprehensive loss, Parent (9,510)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(10,900)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Accumulated other comprehensive loss (9,510)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(10,900)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total shareholders’ equity, Parent 460,898us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
461,209us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total shareholders’ equity 460,898us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
461,209us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total liabilities & shareholders’ equity, Parent 1,056,382us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,093,878us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total liabilities & shareholders’ equity 1,056,382us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,093,878us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Guarantor Subsidiaries [Member]        
Current assets:        
Cash and cash equivalents, Parent 296us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
314us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
340us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
272us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Cash and cash equivalents 296us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
314us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
340us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
272us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Accounts receivable, Parent 2,916us-gaap_AccountsNotesAndLoansReceivableNetCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
3,136us-gaap_AccountsNotesAndLoansReceivableNetCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Accounts receivable 2,916us-gaap_AccountsNotesAndLoansReceivableNetCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
3,136us-gaap_AccountsNotesAndLoansReceivableNetCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Inventories, Parent 6,673us-gaap_InventoryNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
6,060us-gaap_InventoryNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Inventories 6,673us-gaap_InventoryNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
6,060us-gaap_InventoryNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Deferred income taxes 3,399us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
3,945us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Other current assets, Parent 2,355us-gaap_OtherAssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
2,289us-gaap_OtherAssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Other current assets 2,355us-gaap_OtherAssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
2,289us-gaap_OtherAssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total current assets, Parent 15,639us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
15,744us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total current assets 15,639us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
15,744us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Property and equipment, net, Parent 198,647us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
207,063us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Property and equipment, net 198,647us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
207,063us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Due from/(to) subsidiaries, Parent 223,095us-gaap_DueFromRelatedPartiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
243,665us-gaap_DueFromRelatedPartiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Due from/(to) subsidiaries 223,095us-gaap_DueFromRelatedPartiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
243,665us-gaap_DueFromRelatedPartiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Other assets 11,376us-gaap_OtherAssets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
13,011us-gaap_OtherAssets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total assets, Parent 448,757us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
479,483us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total assets 448,757us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
479,483us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Current liabilities:        
Accounts payable, Parent 3,784us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
5,656us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Accounts payable 3,784us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
5,656us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Accrued and other current liabilities, Parent 35,972us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
36,356us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Accrued and other current liabilities 35,972us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
36,356us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Current maturities of long-term debt, including capital leases, Parent 4,919us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
5,157us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Current maturities of long-term debt, including capital leases 4,919us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
5,157us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Income tax payable, Parent 147,749us-gaap_AccruedIncomeTaxesCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
136,391us-gaap_AccruedIncomeTaxesCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total current liabilities, Parent 192,424us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
183,560us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total current liabilities 192,424us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
183,560us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Long-term debt and capital leases, less current maturities, Parent 33,444us-gaap_LongTermDebtAndCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
40,836us-gaap_LongTermDebtAndCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Long-term debt and capital leases, less current maturities 33,444us-gaap_LongTermDebtAndCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
40,836us-gaap_LongTermDebtAndCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Deferred income taxes 4,684us-gaap_DeferredTaxLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
3,945us-gaap_DeferredTaxLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Due to/(from) subsidiaries, Parent 67,992us-gaap_DueToRelatedPartiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
78,612us-gaap_DueToRelatedPartiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Due to/(from) subsidiaries 67,992us-gaap_DueToRelatedPartiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
78,612us-gaap_DueToRelatedPartiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Other deferred liabilities, Parent 13,797rt_OtherDeferredLiabilitiesAndDeferredEscalatingMinimumRent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
14,264rt_OtherDeferredLiabilitiesAndDeferredEscalatingMinimumRent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Other deferred liabilities 13,797rt_OtherDeferredLiabilitiesAndDeferredEscalatingMinimumRent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
14,264rt_OtherDeferredLiabilitiesAndDeferredEscalatingMinimumRent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total liabilities, Parent 312,341us-gaap_Liabilities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
321,217us-gaap_Liabilities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total liabilities 312,341us-gaap_Liabilities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
321,217us-gaap_Liabilities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Shareholders’ equity:        
Retained earnings, Parent 136,416us-gaap_RetainedEarningsAccumulatedDeficit
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
158,266us-gaap_RetainedEarningsAccumulatedDeficit
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Retained earnings 136,416us-gaap_RetainedEarningsAccumulatedDeficit
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
158,266us-gaap_RetainedEarningsAccumulatedDeficit
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total shareholders’ equity, Parent 136,416us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
158,266us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total shareholders’ equity 136,416us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
158,266us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total liabilities & shareholders’ equity, Parent 448,757us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
479,483us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total liabilities & shareholders’ equity $ 448,757us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
$ 479,483us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember