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Restructuring Charges, Net - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013		Apr. 30, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 2,900,000	$ 3,682,000	$ 22,857,000	[1]	$ 929,000
Restructuring liability included in other long-term liabilities	2,400,000	700,000	2,400,000
Long-term restructuring liability, payment term		4 years
Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges		823,000	16,369,000	[1]
Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 2,859,000	$ 6,488,000	[1]
[1] During fiscal 2013, the Company recovered $1.0 million from a legal settlement (related to premises) attributable to a previous restructuring action.

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The time period it will take to pay off the long-term portion of the restructuring liabilities.

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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

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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.

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