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Supplementary Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
--- | ---
Oct. 31, 2014 | Oct. 31, 2013
Supplemental Cash Flow Elements [Abstract] |  |
State and local income tax payments | $ (116) | $ (46)
Federal income tax payments to the Parent | $ (1,850) | $ (354)

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

X
- Definition Amount represents Federal income tax payments to the Parent. + References No definition available. + Details
Name: | valu_FederalIncomeTaxPaymentsToParent
Namespace Prefix: | valu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount represents State and local income tax payments. + References No definition available. + Details
Name: | valu_StateAndLocalIncomeTaxPayments
Namespace Prefix: | valu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration