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Retirement Benefits (Schedule of Costs of Retirement Plans) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Multiemployer Plan [Member]
     
Company Contributions $ 797 $ 792 $ 757
Defined Contribution Plan [Member]
     
Company Costs $ 20,012 $ 18,296 $ 16,646