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Restructuring Charges, Net (Changes In Restructuring Liability) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2010
Restructuring Cost and Reserve [Line Items]
Liability, Beginning period	$ 4,921	$ 13,809
Restructuring (reductions) charges, net	929	2,130	20,673
Reductions for cash payments	(2,910)	(11,497)
Exchange rate fluctuations	(170)	479
Liability, Ending period	2,770	4,921	13,809
Severance [Member]
Restructuring Cost and Reserve [Line Items]
Liability, Beginning period	978	2,714
Restructuring (reductions) charges, net	(324)	(299)
Reductions for cash payments	(586)	(1,518)
Exchange rate fluctuations	(30)	81
Liability, Ending period	38	978
Facilities [Member]
Restructuring Cost and Reserve [Line Items]
Liability, Beginning period	3,943	11,095
Restructuring (reductions) charges, net	1,253	2,429
Reductions for cash payments	(2,324)	(9,979)
Exchange rate fluctuations	(140)	398
Liability, Ending period	$ 2,732	$ 3,943

X

- Definition

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

+ References

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- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

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

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 95-3

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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Amount of foreign currency translation adjustment increasing or decreasing the accrual for a specified type of restructuring cost.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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