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Restructuring Charges, Net (Changes In Restructuring Liability) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Oct. 31, 2013
Oct. 31, 2012
Restructuring Cost and Reserve [Line Items]        
Liability, Beginning period $ 9,825   $ 11,548  
Reductions for cash payments (4,421)   (9,935)  
Restructuring charges, net   15,495 3,682 15,495
Exchange rate fluctuations 167   276  
Liability, Ending period 5,571   5,571  
Severance
        
Restructuring Cost and Reserve [Line Items]        
Liability, Beginning period 2,706   4,819  
Reductions for cash payments (2,160)   (5,214)  
Restructuring charges, net     823  
Exchange rate fluctuations 38   156  
Liability, Ending period 584   584  
Facilities
        
Restructuring Cost and Reserve [Line Items]        
Liability, Beginning period 7,119   6,729  
Reductions for cash payments (2,261)   (4,721)  
Restructuring charges, net     2,859  
Exchange rate fluctuations 129   120  
Liability, Ending period $ 4,987   $ 4,987