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v2.4.0.8

Variable interest entity - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 1 Months Ended
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Oct. 31, 2012
Variable Interest Entity [Line Items] |
Reduction in total assets | $ 1.6
Reduction in total liabilities | $ 1.4

X
- Definition Increase (Decrease) in Assets + References No definition available. + Details
Name: | rfil_IncreaseDecreaseInAssets
Namespace Prefix: | rfil_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Increase (Decrease) in Total Liabilities + References No definition available. + Details
Name: | rfil_IncreaseDecreaseInTotalLiabilities
Namespace Prefix: | rfil_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_VariableInterestEntityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration