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Supplementary Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2011
Supplemental Cash Flow Elements [Abstract] |  |  |
State and local income tax payments | $ (120) | $ (159) | $ (15)
Federal income tax payments to the Parent | (1,877) | (845) | (348)
Federal income tax refunds |  |  | 1,598
Interest payments |  |  | $ (2)

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

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- Definition Amount represents federal income tax refund to the parent. + References No definition available. + Details
Name: | valu_FederalIncomeTaxRefundFromParent
Namespace Prefix: | valu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount represents interest payments during the period. + References No definition available. + Details
Name: | valu_InterestPayments
Namespace Prefix: | valu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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