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Income tax provision - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014	Oct. 31, 2014
Income Taxes [Line Items]
Unrecognized tax benefits	$ 0us-gaap_UnrecognizedTaxBenefits		$ 0us-gaap_UnrecognizedTaxBenefits		$ 0us-gaap_UnrecognizedTaxBenefits
Accrued interest and penalties related to uncertain tax positions	$ 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued		$ 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued		$ 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Provision for income tax as percentage of income before income taxes	39.00%rfil_TotalProvisionAsPercentageOfPreTaxIncome	40.00%rfil_TotalProvisionAsPercentageOfPreTaxIncome	35.00%rfil_TotalProvisionAsPercentageOfPreTaxIncome	35.00%rfil_TotalProvisionAsPercentageOfPreTaxIncome

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- Definition

Total Provision as Percentage Of Pre-Tax Income.

+ References

No definition available.

+ Details

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- Definition

Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

-URI http://asc.fasb.org/extlink&oid=6527854



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15A

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

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- Definition

Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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