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Stockholders' Equity - Non-cash compensation expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Sep. 30, 2019
Stockholders' Equity          
Non-cash compensation expense related to stock-based awards $ 5,412 $ 4,402 $ 15,271 $ 10,760  
Estimated forfeiture rate (as a percent)     12.50%   12.50%
Cost of sales          
Stockholders' Equity          
Non-cash compensation expense related to stock-based awards 857 498 $ 2,139 1,236  
Selling, general and administrative          
Stockholders' Equity          
Non-cash compensation expense related to stock-based awards 4,555 $ 3,904 13,132 $ 9,524  
RSUs          
Stockholders' Equity          
Unrecognized compensation cost related to unvested awards $ 50,400   50,400    
Aggregate fair value of awards     $ 48,500    
Weighted-average period of recognition     1 year 6 months