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Restructuring (Tables)
3 Months Ended12 Months Ended
Jul. 31, 2011
Apr. 30, 2011
Restructuring (Tables) [Abstract]  
Restructuring and related charges
                                                 
                    Site Preparation                    
    Long-Lived     Employee     and Equipment     Production              
    Asset Charges     Separation     Relocation     Start-up     Other Costs     Total  
 
Total expected restructuring charge
  $ 118,000     $ 60,000     $ 23,500     $ 23,000     $ 10,500     $ 235,000  
 
Balance at May 1, 2010
  $ 0     $ 1,089     $ 0     $ 0     $ 0     $ 1,089  
Charge to expense
    53,569       36,010       6,192       5,194       992       101,957  
Cash payments
    0       (18,361 )     (6,192 )     (5,194 )     (992 )     (30,739 )
Noncash utilization
    (53,569 )     (8,540 )     0       0       0       (62,109 )
 
Balance at April 30, 2011
  $ 0     $ 10,198     $ 0     $ 0     $ 0     $ 10,198  
Charge to expense
    9,655       5,785       1,988       1,738       397       19,563  
Cash payments
    0       (3,505 )     (1,988 )     (1,738 )     (397 )     (7,628 )
Noncash utilization
    (9,655 )     (909 )     0       0       0       (10,564 )
 
Balance at July 31, 2011
  $ 0     $ 11,569     $ 0     $ 0     $ 0     $ 11,569  
 
Remaining expected restructuring charge
  $ 50,906     $ 17,066     $ 14,913     $ 16,052     $ 8,832     $ 107,769  
 
The following table summarizes the restructuring activity, including the reserves established and the total amount expected to be incurred.
                                                 
                    Site Preparation                    
    Long-Lived     Employee     and Equipment     Production              
    Asset Charges     Separation     Relocation     Start-up     Other Costs     Total  
 
Total expected restructuring charge
  $ 118,000     $ 60,000     $ 23,500     $ 23,000     $ 10,500     $ 235,000  
 
Balance at May 1, 2009
  $ 0     $ 0     $ 0     $ 0     $ 0     $ 0  
Charge to expense
    3,870       1,139       407       16       279       5,711  
Cash payments
    0       (50 )     (407 )     (16 )     (279 )     (752 )
Noncash utilization
    (3,870 )     0       0       0       0       (3,870 )
 
Balance at April 30, 2010
  $ 0     $ 1,089     $ 0     $ 0     $ 0     $ 1,089  
Charge to expense
    53,569       36,010       6,192       5,194       992       101,957  
Cash payments
    0       (18,361 )     (6,192 )     (5,194 )     (992 )     (30,739 )
Noncash utilization
    (53,569 )     (8,540 )     0       0       0       (62,109 )
 
Balance at April 30, 2011
  $ 0     $ 10,198     $ 0     $ 0     $ 0     $ 10,198  
 
Remaining expected restructuring charge
  $ 60,561     $ 22,851     $ 16,901     $ 17,790     $ 9,229     $ 127,332