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Summary of Significant Accounting Policies (Goodwill) (Details)
$ in Thousands
Jun. 30, 2014
USD ($)
industry
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2013
USD ($)
Sep. 30, 2012
USD ($)
Goodwill [Line Items]            
Target companies equity benchmark 50.00%          
Number of industries encompasses similar products | industry 3          
Control premium percent 35.00%          
Market Capitalization $ 235,800   $ 238,600      
Carrying value $ 273,010 $ 274,938 $ 270,643 $ 265,298 $ 274,243 $ 270,834
Percent fair value in excess of carrying value of goodwill 17.00%   19.00%      
Minimum            
Goodwill [Line Items]            
Control premium percent 30.00%          
Maximum            
Goodwill [Line Items]            
Control premium percent 40.00%