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Changes In Restructuring Liability (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2016
Jan. 31, 2015
Restructuring Cost and Reserve [Line Items]        
Liability, Beginning period $ 665   $ 1,146  
Restructuring charges, net 30,577 $ (418) 30,577 $ 9,468
Reductions for cash payments (8,053)   (8,515)  
Non-cash items (1,690)   (1,690)  
Exchange rate fluctuations (179)   (198)  
Liability, Ending period 21,320   21,320  
Severance        
Restructuring Cost and Reserve [Line Items]        
Liability, Beginning period 156   375  
Restructuring charges, net 29,877   29,877  
Reductions for cash payments (7,962)   (8,176)  
Non-cash items (1,690)   (1,690)  
Exchange rate fluctuations (119)   (124)  
Liability, Ending period 20,262   20,262  
Facilities        
Restructuring Cost and Reserve [Line Items]        
Liability, Beginning period 509   771  
Restructuring charges, net 700   700  
Reductions for cash payments (91)   (339)  
Exchange rate fluctuations (60)   (74)  
Liability, Ending period $ 1,058   $ 1,058