XML 50 R39.htm IDEA: XBRL DOCUMENT v3.10.0.1

Stock-based compensation and equity transactions - Summary of fair value of employee and non-employee directors' stock options (Detail)	9 Months Ended
	Jul. 31, 2018	Jul. 31, 2017
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Risk-free interest rate	1.87%	1.20%
Dividend yield	3.28%	5.00%
Expected life of the option	4 years 6 months 14 days	4 years 3 months 22 days
Volatility factor	46.83%	43.30%

X

- Definition

Period the instruments, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	rfil_FairValueAssumptionExpectedTerm
Namespace Prefix:	rfil_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Risk-free interest rate assumption used in valuing an instruments.

+ References

No definition available.

+ Details

Name:	rfil_FairValueAssumptionRiskFreeInterestRate
Namespace Prefix:	rfil_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Expected dividend to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

+ References

No definition available.

+ Details

Name:	rfil_FairValueAssumptionWeightedAverageExpectedDividend
Namespace Prefix:	rfil_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Measure of dispersion, in percentage term (for instance, the standard deviation or variance), for a given stock price.

+ References

No definition available.

+ Details

Name:	rfil_FairValueAssumptionWeightedAverageVolatilityRate
Namespace Prefix:	rfil_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration