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Summary of Significant Accounting Policies (Goodwill) (Details) (USD $)
12 Months Ended
Sep. 30, 2013
Jun. 30, 2013
Sep. 30, 2012
Jun. 30, 2012
industry
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2012
Minimum
Sep. 30, 2012
Maximum
Goodwill [Line Items]                
Target companies equity benchmark       50.00%        
Number of industries encompasses similar products       3        
Control premium percent range             30.00% 45.00%
Control premium percent       40.00%        
Market Capitalization $ 255,300,000 $ 241,400,000   $ 264,300,000        
Carrying value $ 274,266,000 $ 272,300,000 $ 270,857,000 $ 265,700,000 $ 260,716,000 $ 240,556,000    
Percent fair value in excess of carrying value of goodwill 30.00% 24.00%   39.00%