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Fair Value of Financial Assets and Liabilities that were Measured at Fair Value on a Recurring Basis (Detail) (USD $)
In Thousands
Sep. 30, 2011
Jun. 30, 2011
Assets:  
Derivatives$ 8,830$ 638
Liabilities:  
Derivatives37,56339,561
Significant Other Observable Inputs (Level 2)
  
Assets:  
Derivatives8,830638
Liabilities:  
Derivatives$ 37,563$ 39,561