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Divestitures (Tables)
12 Months Ended
Sep. 30, 2011
Divestitures [Abstract] 
Results of discontinued operations
 
                         
    2011     2010     2009  
 
Revenues
  $ 3,148     $ 167,720     $ 230,022  
                         
Income from discontinued operations before income taxes
    6,934       181,973       84,233  
Less income tax provision
    792       40,703       19,975  
                         
Income from discontinued operations, net
  $ 6,142     $ 141,270     $ 64,258