XML 24 R43.htm IDEA: XBRL DOCUMENT v2.4.0.8
Restructuring Charges, Net - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Jan. 31, 2013
Jan. 31, 2014
Jan. 31, 2013
Apr. 30, 2013
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 4,441,000 $ 3,682,000 $ 19,936,000  
Restructuring liability included in other long-term liabilities   1,000,000   2,400,000
Long-term restructuring liability, payment term   4 years    
Severance
       
Restructuring Cost and Reserve [Line Items]        
Restructuring charges   823,000    
Facilities
       
Restructuring Cost and Reserve [Line Items]        
Restructuring charges   $ 2,859,000