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Acquisitions - Amounts of Assets and Liabilities at Fair Value as of Acquisition Date (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Sep. 30, 2016
Business Acquisition [Line Items]    
Goodwill $ 210,609 $ 202,138
Cool Lab, LLC    
Business Acquisition [Line Items]    
Inventory 1,283  
Intangible assets 6,100  
Goodwill 8,527  
Accrued liabilities (30)  
Other liabilities (686)  
Total purchase price $ 15,194