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Goodwill and Other Identifiable Intangible Assets, Net (Additional Information) (Details)
$ in Thousands
Jun. 30, 2014
industry
Jun. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Goodwill [Line Items]      
Market capitalization   $ 238,600  
Carrying value   $ 270,643 $ 265,298
Control premium percent 35.00%    
Percent fair value in excess of carrying value of goodwill   19.00%  
Target companies equity benchmark 50.00%    
Number of industries encompasses similar products | industry 3    
Minimum      
Goodwill [Line Items]      
Control premium percent 30.00%    
Maximum      
Goodwill [Line Items]      
Control premium percent 40.00%