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Derivative Financial Instruments (Tables)
3 Months Ended
Jul. 31, 2012
Derivative Financial Instruments [Abstract]  
Fair value of derivative instruments
                                 
    July 31, 2012     April 30, 2012  
    Other
Current
Assets
    Other
Current
Liabilities
    Other
Current
Assets
    Other
Current
Liabilities
 

Derivatives designated as hedging instruments:

                               

Commodity contracts

  $ 10,441     $ 3,282     $ 6,569     $ 19,510  
   

 

 

   

 

 

   

 

 

   

 

 

 

Total derivatives designated as hedging instruments

  $ 10,441     $ 3,282     $ 6,569     $ 19,510  
   

 

 

   

 

 

   

 

 

   

 

 

 

Derivatives not designated as hedging instruments:

                               

Commodity contracts

  $ 24,366     $ 10,286     $ 3,166     $ 3,631  

Foreign currency exchange contracts

    205       549       436       982  
   

 

 

   

 

 

   

 

 

   

 

 

 

Total derivatives not designated as hedging instruments

  $ 24,571     $ 10,835     $ 3,602     $ 4,613  
   

 

 

   

 

 

   

 

 

   

 

 

 

Total derivatives instruments

  $ 35,012     $ 14,117     $ 10,171     $ 24,123  
   

 

 

   

 

 

   

 

 

   

 

 

 
Commodity contracts gains and losses recognized on derivatives designated as cash flow hedges
                 
    Three Months Ended July 31,  
    2012     2011  

Losses recognized in other comprehensive loss (effective portion)

  $ (2,210   $ (6,014

(Losses) gains reclassified from accumulated other comprehensive loss to cost of products sold (effective portion)

    (6,538     6,108  
   

 

 

   

 

 

 

Change in accumulated other comprehensive loss

  $ 4,328     $ (12,122
   

 

 

   

 

 

 

Losses recognized in cost of products sold (ineffective portion)

  $ (84   $ (121
   

 

 

   

 

 

 
Interest rate contract gains and losses recognized on the derivative designated as a cash flow hedge
                 
    Three Months Ended July 31,  
    2012     2011  

Gains recognized in other comprehensive loss (effective portion)

  $ 0     $ 0  

Losses reclassified from accumulated other comprehensive loss to interest expense (effective portion)

    (132     0  
   

 

 

   

 

 

 

Change in accumulated other comprehensive loss

  $ 132     $ 0  
   

 

 

   

 

 

 

Gains recognized in interest expense (ineffective portion)

  $ 0     $ 0  
   

 

 

   

 

 

 
Net realized and unrealized gains and losses recognized in cost of products sold on derivatives not designated as qualified hedging instruments
                 
    Three Months Ended
July  31,
 
    2012     2011  

Unrealized gains on commodity contracts

  $ 19,622     $ 4,401  

Unrealized gains (losses) on foreign currency exchange contracts

    102       (205
   

 

 

   

 

 

 

Total unrealized gains recognized in cost of products sold

  $ 19,724     $ 4,196  
   

 

 

   

 

 

 

Realized (losses) gains on commodity contracts

  $ (7,841   $ 9,296  

Realized gains on foreign currency exchange contracts

    103       290  
   

 

 

   

 

 

 

Total realized (losses) gains recognized in cost of products sold

  $ (7,738   $ 9,586  
   

 

 

   

 

 

 

Total gains recognized in cost of products sold

  $ 11,986     $ 13,782  
   

 

 

   

 

 

 
Outstanding derivative contracts
                 
    July 31, 2012     April 30, 2012  

Commodity contracts

  $ 926,765     $ 983,381  

Foreign currency exchange contracts

    121,398       94,424