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Accrued expenses - Additional Information (Detail)	Apr. 30, 2017 USD ($)
Other Noncurrent Liabilities [Member]
Schedule Of Accrued Liabilities [Line Items]
Accrued Earn Out Liability Non Current	$ 20,000

X

- 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

X

- 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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: