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Acquisitions
 9 Months Ended
Jan. 31, 2014
Acquisitions

11. Acquisitions

During the three months ended January 31, 2014, adjustments to the preliminary purchase price allocation relating to the PDI acquisition, resulted in a $0.1 million increase in net assets acquired and a decrease in goodwill of $0.1 million. During the nine months ended January 31, 2014, adjustments to the preliminary purchase price allocation relating to the PDI acquisition, resulted in an increase in the purchase price and goodwill of $0.2 million.

During the nine months ended January 31, 2014, the Company paid contingent consideration to the selling stockholders of PDI of $15 million, as required under the merger agreement, as a result of the achievement of certain pre-determined goals associated with expense synergies.