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Changes In Restructuring Liability (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2014
Jan. 31, 2013
Restructuring Cost and Reserve [Line Items]        
Liability, Beginning period $ 5,571   $ 11,548  
Reductions for cash payments (1,803)   (11,738)  
Restructuring charges, net   4,441 3,682 19,936
Exchange rate fluctuations (23)   253  
Liability, Ending period 3,745   3,745  
Severance
        
Restructuring Cost and Reserve [Line Items]        
Liability, Beginning period 584   4,819  
Reductions for cash payments (617)   (5,831)  
Restructuring charges, net     823  
Exchange rate fluctuations 83   239  
Liability, Ending period 50   50  
Facilities
        
Restructuring Cost and Reserve [Line Items]        
Liability, Beginning period 4,987   6,729  
Reductions for cash payments (1,186)   (5,907)  
Restructuring charges, net     2,859  
Exchange rate fluctuations (106)   14  
Liability, Ending period $ 3,695   $ 3,695