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Concentrations of credit risk - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Concentration Risk [Line Items]    
Cash, FDIC insured amount 14.2us-gaap_CashFDICInsuredAmount  
Concentration agreement with major customer 15 years  
Sales Revenue, Goods, Net    
Concentration Risk [Line Items]    
Concentration risk, percentage 34.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember		 50.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
Accounts Receivable    
Concentration Risk [Line Items]    
Concentration risk, percentage 22.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember		 27.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
Optiflex Customer Concentration Risk    
Concentration Risk [Line Items]    
Concentration risk, percentage 11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= rfil_OptiflexCustomerConcentrationRiskMember		 38.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= rfil_OptiflexCustomerConcentrationRiskMember
Sales revenue, goods, net 2.5us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= rfil_OptiflexCustomerConcentrationRiskMember		 14.0us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= rfil_OptiflexCustomerConcentrationRiskMember