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Acquisitions
 3 Months Ended
Jul. 31, 2013
Acquisitions

11. Acquisitions

During the three months ended July 31, 2013, adjustments to the preliminary purchase price allocation relating to the PDI acquisition, resulted in a $0.1 million decrease in in net assets acquired and an increase in the purchase price and goodwill of $0.2 million and $0.3 million, respectively. As of July 31, 2013, the purchase price allocation relating to PDI remains preliminary as it relates to income taxes, among other things.

During the three months ended July 31, 2013, 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.