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Summary of Significant Accounting Policies (Goodwill) (Details)
$ in Thousands
Jun. 30, 2014
industry
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2013
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     $ 278,600      
Carrying value   $ 300,029 $ 294,900 $ 274,938 $ 265,298 $ 274,243
Percent fair value in excess of carrying value of goodwill     27.00%      
Minimum            
Goodwill [Line Items]            
Control premium percent 30.00%          
Maximum            
Goodwill [Line Items]            
Control premium percent 40.00%