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Stock Repurchase Program - Additional Information (Detail) - shares | Oct. 31, 2016 | Apr. 30, 2014
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Stock Repurchase Program [Line Items] |  |
Stock Repurchase Program Number Of Shares Authorized To Be Repurchased | 0 |
Board Of Directors |  |
Stock Repurchase Program [Line Items] |  |
Stock Repurchase Program Number Of Shares Authorized To Be Repurchased |  | 500,000

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- Definition Stock repurchase program. + References No definition available. + Details
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Namespace Prefix: | rfil_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_TitleOfIndividualAxis=us-gaap_BoardOfDirectorsChairmanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |