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Goodwill and Other Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Summary of changes in the Partnership's goodwill    
Balance on beginning $ 199,296 $ 199,052
Goodwill acquisitions 1,807 244
Balance on Ending $ 201,103 $ 199,296