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Changes In Restructuring Liability (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2013
Restructuring Cost and Reserve [Line Items]      
Liability, Beginning period $ 2,813 $ 11,548  
Restructuring charges, net 9,468 3,682 $ 22,857
Reductions for cash payments (10,582) (12,705)  
Exchange rate fluctuations (553) 288  
Liability, Ending period 1,146 2,813 11,548
Severance      
Restructuring Cost and Reserve [Line Items]      
Liability, Beginning period   4,819  
Restructuring charges, net 9,224 823 16,300
Reductions for cash payments (8,396) (5,884)  
Exchange rate fluctuations (453) 242  
Liability, Ending period 375   4,819
Facilities      
Restructuring Cost and Reserve [Line Items]      
Liability, Beginning period 2,813 6,729  
Restructuring charges, net 244 2,859 6,500
Reductions for cash payments (2,186) (6,821)  
Exchange rate fluctuations (100) 46  
Liability, Ending period $ 771 $ 2,813 $ 6,729