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Acquisitions - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2014 | Jan. 31, 2014
Business Acquisition [Line Items] |  |
Acquisition of a business, contingent consideration |  | $ 15,000,000
PDI Ninth House |  |
Business Acquisition [Line Items] |  |
Business acquisition, adjustments to the preliminary purchase price allocation, increase in net assets acquired | 100,000 |
Business acquisition, adjustments to the preliminary purchase price allocation, increase in the purchase price |  | 200,000
Business acquisition, adjustments to the preliminary purchase price allocation, increase (decrease) in Goodwill | (100,000) | 200,000
Acquisition of a business, contingent consideration |  | $ 15,000,000

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- Definition Business Acquisition Purchase Price Adjustments + References No definition available. + Details
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- Definition Payment of earn-outs from acquisitions. + References No definition available. + Details
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- Details
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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e961-128460 + Details
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