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Subsequent events - Additional Information (Detail) (USD $)
0 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 0 Months Ended 12 Months Ended
Nov. 02, 2014
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2015
Apr. 30, 2014
May 19, 2015
Jun. 05, 2015
Oct. 31, 2014
Jan. 31, 2015
Jun. 08, 2015
Subsequent Event [Line Items]                    
Common Stock Value   $ 85,000us-gaap_CommonStockValue   $ 85,000us-gaap_CommonStockValue       $ 83,000us-gaap_CommonStockValue    
Share Price                 $ 1.01us-gaap_SharePrice  
Revenues   8,076,000us-gaap_Revenues 5,764,000us-gaap_Revenues 14,969,000us-gaap_Revenues 11,614,000us-gaap_Revenues          
Business Combination, Consideration Transferred 645,000us-gaap_BusinessCombinationConsiderationTransferred1     3,090,000us-gaap_BusinessCombinationConsiderationTransferred1            
Payments to Acquire Businesses, Gross 3,090,000us-gaap_PaymentsToAcquireBusinessesGross                  
Subsequent Event                    
Subsequent Event [Line Items]                    
Payments to Acquire Productive Assets           700,000us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
       
Dividends Payable, Amount Per Share                   $ 0.07us-gaap_DividendsPayableAmountPerShare
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Subsequent Event | Rel Tech Electronics [Member]                    
Subsequent Event [Line Items]                    
Equity Method Investment, Ownership Percentage             100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= rfil_RelTechElectronicsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Common Stock Value             200,000us-gaap_CommonStockValue
/ dei_LegalEntityAxis
= rfil_RelTechElectronicsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Salaries, Wages and Officers' Compensation             150,000us-gaap_SalariesWagesAndOfficersCompensation
/ dei_LegalEntityAxis
= rfil_RelTechElectronicsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Share Price             $ 3.96us-gaap_SharePrice
/ dei_LegalEntityAxis
= rfil_RelTechElectronicsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Number Of Consecutive Trading Days             5 days      
Earn Out Payments             800,000rfil_EarnOutPayments
/ dei_LegalEntityAxis
= rfil_RelTechElectronicsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Revenues               7,700,000us-gaap_Revenues
/ dei_LegalEntityAxis
= rfil_RelTechElectronicsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Business Combination, Consideration Transferred             3,100,000us-gaap_BusinessCombinationConsiderationTransferred1
/ dei_LegalEntityAxis
= rfil_RelTechElectronicsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Payments to Acquire Businesses, Gross             $ 2,100,000us-gaap_PaymentsToAcquireBusinessesGross
/ dei_LegalEntityAxis
= rfil_RelTechElectronicsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Stock Issued During Period, Shares, Acquisitions             50,467us-gaap_StockIssuedDuringPeriodSharesAcquisitions
/ dei_LegalEntityAxis
= rfil_RelTechElectronicsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Subsequent Event | Mr Palumbo [Member] | Rel Tech Electronics [Member]                    
Subsequent Event [Line Items]                    
Percentage Of Annual Bonus On Base Salary             50.00%rfil_PercentageOfAnnualBonusOnBaseSalary
/ dei_LegalEntityAxis
= rfil_RelTechElectronicsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TitleOfIndividualAxis
= rfil_MrPalumboMember