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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 |  | $ 85,000 us-gaap_CommonStockValue |  | $ 85,000 us-gaap_CommonStockValue |  |  |  | $ 83,000 us-gaap_CommonStockValue |  |
Share Price |  |  |  |  |  |  |  |  | $ 1.01 us-gaap_SharePrice |
Revenues |  | 8,076,000 us-gaap_Revenues | 5,764,000 us-gaap_Revenues | 14,969,000 us-gaap_Revenues | 11,614,000 us-gaap_Revenues |  |  |  |  |
Business Combination, Consideration Transferred | 645,000 us-gaap_BusinessCombinationConsiderationTransferred1 |  |  | 3,090,000 us-gaap_BusinessCombinationConsiderationTransferred1 |  |  |  |  |  |
Payments to Acquire Businesses, Gross | 3,090,000 us-gaap_PaymentsToAcquireBusinessesGross |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Payments to Acquire Productive Assets |  |  |  |  |  | 700,000 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |
Dividends Payable, Amount Per Share |  |  |  |  |  |  |  |  |  | $ 0.07 us-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 |  |  |  |  |  |  | 200,000 us-gaap_CommonStockValue / dei_LegalEntityAxis = rfil_RelTechElectronicsMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Salaries, Wages and Officers' Compensation |  |  |  |  |  |  | 150,000 us-gaap_SalariesWagesAndOfficersCompensation / dei_LegalEntityAxis = rfil_RelTechElectronicsMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Share Price |  |  |  |  |  |  | $ 3.96 us-gaap_SharePrice / dei_LegalEntityAxis = rfil_RelTechElectronicsMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Number Of Consecutive Trading Days |  |  |  |  |  |  | 5 days |  |  |
Earn Out Payments |  |  |  |  |  |  | 800,000 rfil_EarnOutPayments / dei_LegalEntityAxis = rfil_RelTechElectronicsMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Revenues |  |  |  |  |  |  |  | 7,700,000 us-gaap_Revenues / dei_LegalEntityAxis = rfil_RelTechElectronicsMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  | 3,100,000 us-gaap_BusinessCombinationConsiderationTransferred1 / dei_LegalEntityAxis = rfil_RelTechElectronicsMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  |  |  | $ 2,100,000 us-gaap_PaymentsToAcquireBusinessesGross / dei_LegalEntityAxis = rfil_RelTechElectronicsMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Stock Issued During Period, Shares, Acquisitions |  |  |  |  |  |  | 50,467 us-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 |  |  |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Number of shares of stock issued during the period pursuant to acquisitions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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