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Investment (Additional Information) (Details) (Solicore, Inc. [Member], USD $)
3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2009
Mar. 31, 2013
Solicore, Inc. [Member]
       
Schedule of Investments [Line Items]        
Investment in joint venture $ 300,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rog_SolicoreInc.Member
$ 500,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rog_SolicoreInc.Member
$ 5,000,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rog_SolicoreInc.Member
$ 100,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rog_SolicoreInc.Member
Financing raised by investee     13,300,000rog_FinancingRaisedbyInvestee
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rog_SolicoreInc.Member
 
Impairment charge $ 200,000us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rog_SolicoreInc.Member
$ 4,600,000us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rog_SolicoreInc.Member