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Divestitures (Details) - USD ($)
9 Months Ended
May 27, 2016
May 27, 2016
Sep. 30, 2016
Divestitures      
Pre-tax gain on sale     $ 21,000
ITG Investment Research | Sale of subsidiaries      
Divestitures      
Cash proceeds from sale   $ 12,000,000  
Carrying value of net assets disposed   (7,502,000)  
Direct selling costs   (4,477,000)  
Pre-tax gain on sale   $ 21,000 $ 21,000
After-tax gain on sale of business $ 50,000