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Acquisitions - Additional Information (Detail) (USD $)	6 Months Ended
	Oct. 31, 2013
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, change 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 in Goodwill	300,000
Acquisition of a business, contingent consideration	$ 15,000,000

X

- Definition

Business Acquisition Assets Acquired Adjustments

+ References

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- Definition

Payment of earn-outs from acquisitions.

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- Definition

Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472



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-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 55

-Paragraph 37

-URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464

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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



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-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

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