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Related Party Transactions - Income from non-voting revenues interest and non-voting profits interests in EAM (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2015
Jan. 31, 2014
Related Party Transactions [Abstract]        
Non-voting revenues interest in EAM $ 1,862valu_NonVotingRevenuesInterestInUnconsolidatedEntity $ 1,767valu_NonVotingRevenuesInterestInUnconsolidatedEntity $ 5,498valu_NonVotingRevenuesInterestInUnconsolidatedEntity $ 5,028valu_NonVotingRevenuesInterestInUnconsolidatedEntity
Non-voting profits interest in EAM 162valu_NonVotingProfitsInterestInUnconsolidatedEntity 207valu_NonVotingProfitsInterestInUnconsolidatedEntity 497valu_NonVotingProfitsInterestInUnconsolidatedEntity 569valu_NonVotingProfitsInterestInUnconsolidatedEntity
Non-voting Revenues and Non-voting profits interests in EAM Trust $ 2,024valu_RevenuesAndProfitsDistributionFromUnconsolidatedEntity $ 1,974valu_RevenuesAndProfitsDistributionFromUnconsolidatedEntity $ 5,995valu_RevenuesAndProfitsDistributionFromUnconsolidatedEntity $ 5,597valu_RevenuesAndProfitsDistributionFromUnconsolidatedEntity