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Restructuring Charges, Net - Changes In Restructuring Liability (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2016
Restructuring Cost and Reserve [Line Items]      
Liability, Beginning period $ 13,695 $ 5,962  
Restructuring charges, net 78 34,600 $ 33,013
Reductions for cash payments (10,591) (23,677)  
Non-cash items   (2,024)  
Exchange rate fluctuations 814 (1,166)  
Liability, Ending period 3,996 13,695 5,962
Severance      
Restructuring Cost and Reserve [Line Items]      
Liability, Beginning period 5,341 5,293  
Restructuring charges, net   15,963 32,100
Reductions for cash payments (4,541) (14,974)  
Exchange rate fluctuations 251 (941)  
Liability, Ending period 1,051 5,341 5,293
Facilities      
Restructuring Cost and Reserve [Line Items]      
Liability, Beginning period 8,354 669  
Restructuring charges, net 78 18,637 900
Reductions for cash payments (6,050) (8,703)  
Non-cash items   (2,024)  
Exchange rate fluctuations 563 (225)  
Liability, Ending period $ 2,945 $ 8,354 $ 669