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Changes In Restructuring Liability (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Oct. 31, 2016
Oct. 31, 2016
Restructuring Cost and Reserve [Line Items]    
Liability, Beginning period $ 21,250 $ 5,962
Restructuring charges, net   24,520
Reductions for cash payments (8,400) (14,975)
Reductions for non-cash charges   (2,480)
Exchange rate fluctuations (919) (1,096)
Liability, Ending period 11,931 11,931
Severance    
Restructuring Cost and Reserve [Line Items]    
Liability, Beginning period 11,866 5,293
Restructuring charges, net   11,472
Reductions for cash payments (6,217) (11,005)
Exchange rate fluctuations (644) (755)
Liability, Ending period 5,005 5,005
Facilities    
Restructuring Cost and Reserve [Line Items]    
Liability, Beginning period 9,384 669
Restructuring charges, net   13,048
Reductions for cash payments (2,183) (3,970)
Reductions for non-cash charges   (2,480)
Exchange rate fluctuations (275) (341)
Liability, Ending period $ 6,926 $ 6,926