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Commitments and Contingencies (Tables)
12 Months Ended
Sep. 30, 2011
Commitments and Contingencies Disclosure 
Future Minimum Rental Payments
         
Year Ending September 30,        
2012
  $ 7,219  
2013
    5,583  
2014
    4,706  
2015
    3,620  
2016
    2,814  
Thereafter
    7,508  
 
     
Total
  $ 31,450  
 
     
Rent Expense for All Operating Leases
                         
    Year Ending September 30,  
    2011     2010     2009  
 
                       
Rent expense
  $ 10,159     $ 9,604     $ 11,155  
Future Minimum Unconditional Purchase Obligations
         
Year Ending September 30,        
2012
  $ 242,735  
2013
    9,383  
2014
    376  
2015
    5  
2016
     
Thereafter
     
 
     
Total
  $ 252,499