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Stock Compensation (Tables)
9 Months Ended
Jun. 30, 2011
Stock Compensation [Abstract]  
Compensation costs included in net income
                                 
    Three Months Ended     Nine Months Ended  
    June 30,     June 30,  
    2011     2010     2011     2010  
Gross compensation cost
  $ 1,508     $ 1,113     $ 11,536     $ 3,457  
Income tax benefits
    (499 )     (385 )     (3,952 )     (1,216 )
 
                       
Stock compensation cost, net of tax benefit
  $ 1,009     $ 728     $ 7,584     $ 2,241