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Restructuring Charges Net - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012	Apr. 30, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 4,441,000	$ 929,000	$ 19,936,000	$ 929,000
Restructuring liability included in other long-term liabilities	3,300,000		3,300,000		1,400,000
Long-term restructuring liability, payment term (in years)	13 years		13 years
Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges			15,700,000
Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 4,200,000

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.

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