Annual report pursuant to Section 13 and 15(d)

Restructuring Charges, Net - Additional Information (Detail)

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Restructuring Charges, Net - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended
Apr. 30, 2013
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2011
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 2,900,000 $ 22,857,000 [1] $ 929,000 $ 2,130,000
Restructuring liability included in other long-term liabilities 2,400,000 2,400,000 1,400,000  
Long-term restructuring liability, payment term 5 years 5 years    
Severance
       
Restructuring Cost and Reserve [Line Items]        
Restructuring charges   16,369,000 [1] (324,000)  
Facilities
       
Restructuring Cost and Reserve [Line Items]        
Restructuring charges   $ 6,488,000 [1] $ 1,253,000  
[1] During fiscal 2013, the Company recovered $1.0 million from a legal settlement (related to premises) attributable to a previous restructuring action.