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Related Party Transactions - Income from its non-voting revenues interest and its non-voting profits interests in EAM (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Apr. 30, 2014 | Apr. 30, 2013 | Apr. 30, 2012
Related Party Transactions [Abstract] |  |  |
Non-voting revenues interest in EAM | $ 6,767 | $ 5,781 | $ 5,684
Non-voting profits interest in EAM | 732 | 479 | 206
Revenues and profits interests in EAM Trust | $ 7,499 | $ 6,260 | $ 5,890

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- Details
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Balance Type: | na
Period Type: | duration

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- Definition Represents the income received against non voting profits in unconsolidated entity. + References No definition available. + Details
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Namespace Prefix: | valu_
Data Type: | xbrli:monetaryItemType
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- Definition Represents the income received against non voting revenues in unconsolidated entity. + References No definition available. + Details
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Namespace Prefix: | valu_
Data Type: | xbrli:monetaryItemType
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- Definition Represents the revenues and profits distribution from unconsolidated entity. + References No definition available. + Details
Name: | valu_RevenuesAndProfitsDistributionFromUnconsolidatedEntity
Namespace Prefix: | valu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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