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Retirement Plans (Schedule Of Weighted-Average Assumptions Used To Determine Projected Benefit Obligation) (Details)
12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.20%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate 5.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 7.50%rbc_DefinedBenefitPlanAssumptionsUsedtoDetermineProjectedBenefitObligationExpectedLongtermRateofReturnonPlanAssets 8.00%rbc_DefinedBenefitPlanAssumptionsUsedtoDetermineProjectedBenefitObligationExpectedLongtermRateofReturnonPlanAssets
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase 0.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease 0.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease