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Changes In Restructuring Liability (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2017
Jan. 31, 2016
Restructuring Cost and Reserve [Line Items]        
Liability, Beginning period $ 11,931   $ 5,962  
Restructuring charges, net 3,801 $ 30,577 28,321 $ 30,577
Reductions for cash payments (4,238)   (19,213)  
Increase for non-cashcharges 584      
Reductions for non-cash charges     (1,896)  
Exchange rate fluctuations 483   (613)  
Liability, Ending period 12,561   12,561  
Severance        
Restructuring Cost and Reserve [Line Items]        
Liability, Beginning period 5,005   5,293  
Restructuring charges, net   29,900 11,472 29,900
Reductions for cash payments (1,900)   (12,905)  
Exchange rate fluctuations (71)   (826)  
Liability, Ending period 3,034   3,034  
Facilities        
Restructuring Cost and Reserve [Line Items]        
Liability, Beginning period 6,926   669  
Restructuring charges, net 3,801 $ 700 16,849 $ 700
Reductions for cash payments (2,338)   (6,308)  
Increase for non-cashcharges 584      
Reductions for non-cash charges     (1,896)  
Exchange rate fluctuations 554   213  
Liability, Ending period $ 9,527   $ 9,527