Annual report pursuant to Section 13 and 15(d)

Restructuring Charges, Net (Changes In Restructuring Liability) (Detail)

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Restructuring Charges, Net (Changes In Restructuring Liability) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Apr. 30, 2013
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2011
Restructuring Cost and Reserve [Line Items]        
Liability, Beginning period   $ 2,770 $ 4,921  
Restructuring (reductions) charges, net 2,900 22,857 [1] 929 2,130
Reductions for cash payments   (13,998) (2,910)  
Exchange rate fluctuations   (81) (170)  
Liability, Ending period 11,548 11,548 2,770 4,921
Severance
        
Restructuring Cost and Reserve [Line Items]        
Liability, Beginning period   38 978  
Restructuring (reductions) charges, net   16,369 [1] (324)  
Reductions for cash payments   (11,561) (586)  
Exchange rate fluctuations   (27) (30)  
Liability, Ending period 4,819 4,819 38  
Facilities
        
Restructuring Cost and Reserve [Line Items]        
Liability, Beginning period   2,732 3,943  
Restructuring (reductions) charges, net   6,488 [1] 1,253  
Reductions for cash payments   (2,437) (2,324)  
Exchange rate fluctuations   (54) (140)  
Liability, Ending period $ 6,729 $ 6,729 $ 2,732  
[1] During fiscal 2013, the Company recovered $1.0 million from a legal settlement (related to premises) attributable to a previous restructuring action.