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Restructuring Charges, Net - Additional Information (Detail) (USD $)	3 Months Ended	6 Months Ended
	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012	Apr. 30, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 15,495,000	$ 3,682,000	$ 15,495,000
Restructuring liability included in other long-term liabilities		1,400,000		2,400,000
Long-term restructuring liability, payment term		5 years
Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges		823,000
Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 2,859,000

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- Definition

Long-Term Restructuring Liability Payment Term

+ References

No definition available.

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- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section S99

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-Publisher FASB

-Name Accounting Standards Codification

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 3, 4

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Carrying amount as of the balance sheet date of known and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid after one year or beyond the next operating cycle, if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section 50

-Paragraph 1

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-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869



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