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Equity Method and Other Investments - BioCision, LLC - General Information (Details) - USD ($)
$ in Thousands
2 Months Ended 12 Months Ended
Nov. 28, 2016
Nov. 28, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Schedule of Equity Method Investments [Line Items]          
Equity method investments     $ 28,593 $ 27,273  
Equity in earnings of equity method investments     9,381 $ 2,380 $ (164)
Gain on settlement of equity method investment     1,847    
BioCision, LLC          
Schedule of Equity Method Investments [Line Items]          
Ownership interest (as a percent) 20.00% 20.00%   20.00%  
Equity method investments $ 1,200 $ 1,200   $ 1,700  
Equity in earnings of equity method investments   (500)   $ (1,100) $ (1,000)
Equity in earnings of equity method investments, adjustment   $ 200      
Gain on settlement of equity method investment     $ 1,800    
Cool Lab, LLC          
Schedule of Equity Method Investments [Line Items]          
Equity method investments, fair value disclosure $ 3,100