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Summary of Significant Accounting Policies (Goodwill) (Details) (USD $)
0 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Sep. 30, 2014
Jun. 30, 2014
industry
Sep. 30, 2013
Jun. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Goodwill [Line Items]                
Target companies equity benchmark       50.00%        
Number of industries encompasses similar products       3        
Control premium percent 35.00% 40.00%            
Market Capitalization       $ 235,800,000   $ 241,400,000    
Carrying value     $ 265,298,000 $ 273,010,000 $ 274,243,000 $ 272,239,000 $ 270,834,000 $ 260,693,000
Percent fair value in excess of carrying value of goodwill       17.00%   24.00%    
Minimum
               
Goodwill [Line Items]                
Control premium percent 30.00%              
Maximum
               
Goodwill [Line Items]                
Control premium percent 40.00%