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Earnings Per Share (Tables)
 12 Months Ended
Jun. 30, 2011
Earnings Per Share (Tables) [Abstract]  
Reconciliation of basic average common shares outstanding to diluted average common shares outstanding
                         
    2011     2010     2009  
 
Net income (loss)
  $ 298,808     $ 76,930     $ (322,036 )
                         
Basic average common shares outstanding
    174,812       173,803       174,598  
Effect of dilutive stock options
    1,131       857       —  
                         
Diluted average common shares outstanding
    175,943       174,660       174,598  
                         
Earnings (loss) per share:
                       
Basic
  $ 1.71     $ 0.44     $ (1.84 )
Diluted
  $ 1.70     $ 0.44     $ (1.84 )