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Accrued expenses and other long-term liabilities - Additional Information (Detail) | Oct. 31, 2016 USD ($)
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Other Noncurrent Liabilities [Member] |
Schedule Of Accrued Liabilities [Line Items] |
Accrued Earn Out Liability Non Current | $ 128,000

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- Definition It represents accrued earn out liability non current portion. + References No definition available. + Details
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Namespace Prefix: | rfil_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Schedule of Accrued Liabilities [Line Items] + References No definition available. + Details
Name: | rfil_ScheduleOfAccruedLiabilitiesLineItems
Namespace Prefix: | rfil_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherNoncurrentLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |