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Divestitures (Tables)
9 Months Ended
Jun. 30, 2011
Divestitures [Abstract]  
Results of discontinued operations
                                 
    Three Months Ended     Nine Months Ended  
    June 30,     June 30,  
    2011     2010     2011     2010  
Revenues
  $ 117     $ 47,316     $ 3,124     $ 141,372  
 
                       
 
                               
Income from discontinued operations before income taxes
    5,059       17,088       8,277       50,686  
Less income tax provision
    111       4,340       711       13,058  
 
                       
Income from discontinued operations, net
  $ 4,948     $ 12,748     $ 7,566     $ 37,628