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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Jul. 01, 2019
Property, Plant and Equipment        
% of total 100.00% 100.00%    
Right-of-use operating lease assets $ 16,349   $ 0 $ 16,300
Operating Lease, Liability $ 16,416     $ 16,300
Five Customers [Member]        
Property, Plant and Equipment        
% of total 24.00%   28.00%