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Acquisitions - Pro Forma Information - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Business Acquisition [Line Items]        
Income tax provision (benefit) $ (47,251) $ 3,380 $ 66,250  
Restructuring charges $ 714 $ 3,144 10,210  
Pro Forma | BioStorage Technologies, Inc.        
Business Acquisition [Line Items]        
Aggregate amortization and depreciation expense     600  
Income tax provision (benefit)     $ 500  
Restructuring charges       $ 1,900