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Derivative Financial Instruments (Schedule Of Notional Amounts Of Forward Contracts) (Details) (USD $)
In Millions, unless otherwise specified
Jan. 03, 2015
Dec. 28, 2013
Derivative [Line Items]    
Derivative, Notional Amount $ 100.0invest_DerivativeNotionalAmount $ 250.0invest_DerivativeNotionalAmount
Commodity Forward Contracts [Member] | Copper [Member]    
Derivative [Line Items]    
Derivative, Notional Amount 137.4invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= rbc_CommodityForwardContractsMember
/ us-gaap_TradingActivityByTypeAxis
= rbc_CopperMember		 114.5invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= rbc_CommodityForwardContractsMember
/ us-gaap_TradingActivityByTypeAxis
= rbc_CopperMember
Commodity Forward Contracts [Member] | Aluminum [Member]    
Derivative [Line Items]    
Derivative, Notional Amount $ 5.2invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= rbc_CommodityForwardContractsMember
/ us-gaap_TradingActivityByTypeAxis
= rbc_AluminumMember		 $ 9.7invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= rbc_CommodityForwardContractsMember
/ us-gaap_TradingActivityByTypeAxis
= rbc_AluminumMember