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Accrued expenses - Additional Information (Detail) (Other Noncurrent Liabilities [Member], USD $) | Apr. 30, 2015
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Other Noncurrent Liabilities [Member] |
Schedule Of Accrued Liabilities [Line Items] |
Accrued Earn Out Liability Non Current | $ 318,000 rfil_AccruedEarnOutLiabilityNonCurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember

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

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- Details
Name: | rfil_ScheduleOfAccruedLiabilitiesLineItems
Namespace Prefix: | rfil_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration