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Changes In Restructuring Liability (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Oct. 31, 2014
Oct. 31, 2014
Oct. 31, 2013
Restructuring Cost and Reserve [Line Items]      
Liability, Beginning period $ 8,644 $ 2,813  
Restructuring charges, net   9,886 3,682
Reductions for cash payments (4,175) (8,179)  
Exchange rate fluctuations (284) (335)  
Liability, Ending period 4,185 4,185  
Severance
      
Restructuring Cost and Reserve [Line Items]      
Liability, Beginning period 6,182    
Restructuring charges, net   9,571  
Reductions for cash payments (3,503) (6,835)  
Exchange rate fluctuations (234) (291)  
Liability, Ending period 2,445 2,445  
Facilities
      
Restructuring Cost and Reserve [Line Items]      
Liability, Beginning period 2,462 2,813  
Restructuring charges, net   315  
Reductions for cash payments (672) (1,344)  
Exchange rate fluctuations (50) (44)  
Liability, Ending period $ 1,740 $ 1,740