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Changes In Restructuring Liability (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Apr. 30, 2013
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2012
Restructuring Cost and Reserve [Line Items]        
Liability, Beginning period   $ 11,548 $ 2,770  
Restructuring charges, net 2,900 3,682 22,857 [1] 929
Reductions for cash payments   (12,705) (13,998)  
Exchange rate fluctuations   288 (81)  
Liability, Ending period 11,548 2,813 11,548 2,770
Severance
        
Restructuring Cost and Reserve [Line Items]        
Liability, Beginning period   4,819 38  
Restructuring charges, net   823 16,369 [1]  
Reductions for cash payments   (5,884) (11,561)  
Exchange rate fluctuations   242 (27)  
Liability, Ending period 4,819   4,819  
Facilities
        
Restructuring Cost and Reserve [Line Items]        
Liability, Beginning period   6,729 2,732  
Restructuring charges, net   2,859 6,488 [1]  
Reductions for cash payments   (6,821) (2,437)  
Exchange rate fluctuations   46 (54)  
Liability, Ending period $ 6,729 $ 2,813 $ 6,729  
[1] During fiscal 2013, the Company recovered $1.0 million from a legal settlement (related to premises) attributable to a previous restructuring action.