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Commitments (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Predecessor
Sep. 30, 2012
Inventory related items
Sep. 30, 2012
Open capital commitments
Future minimum rental payments          
2013 $ 112,977        
2014 98,840        
2015 86,950        
2016 77,673        
2017 67,764        
Thereafter 249,380        
Total future minimum rental payments 693,584        
Commitments          
Future purchase commitments       170,768 11,914
Rent expense $ 153,763 $ 149,921 $ 133,719