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Restructuring Charges, Net (Changes In Restructuring Liability) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Jul. 31, 2013
Restructuring Cost and Reserve [Line Items]  
Liability, Beginning period $ 11,548
Restructuring charges, net 3,682
Reductions for cash payments (5,514)
Exchange rate fluctuations 109
Liability, Ending period 9,825
Severance
  
Restructuring Cost and Reserve [Line Items]  
Liability, Beginning period 4,819
Restructuring charges, net 823
Reductions for cash payments (3,054)
Exchange rate fluctuations 118
Liability, Ending period 2,706
Facilities
  
Restructuring Cost and Reserve [Line Items]  
Liability, Beginning period 6,729
Restructuring charges, net 2,859
Reductions for cash payments (2,460)
Exchange rate fluctuations (9)
Liability, Ending period $ 7,119