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Commitments (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Future minimum rental payments      
2014 $ 115,937    
2015 100,295    
2016 90,349    
2017 78,356    
2018 66,190    
Thereafter 232,087    
Total future minimum rental payments 683,214    
Commitments      
Rent expense 146,843 153,763 149,921
Open capital commitments
     
Commitments      
Future purchase commitments $ 5,402