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COMPENSATION PLANS (Narrative) (Details) (USD $)
3 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Apr. 30, 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation $ 1,151,000us-gaap_ShareBasedCompensation $ 1,214,000us-gaap_ShareBasedCompensation  
Restricted stock units issued 75,902us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross    
Unrecognized compensation expense 4,000,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions    
Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Compensation expense recognized $ 1,200,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
$ 1,200,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
Restricted Stock Units [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Restricted Stock Units [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 5 years    
2007 SIP [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares reserved for future issuance     2,550,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= rgr_StockIncentivePlan2007Member
Shares available for future grants 552,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= rgr_StockIncentivePlan2007Member