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Stockholders' Equity - Non-cash compensation expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2020
Stockholders' Equity          
Non-cash compensation expense related to stock-based awards $ 6,472 $ 5,382 $ 11,151 $ 9,859  
Estimated forfeiture rate (as a percent)     12.50%   12.50%
Cost of sales          
Stockholders' Equity          
Non-cash compensation expense related to stock-based awards 771 743 $ 1,372 1,282  
Selling, general and administrative          
Stockholders' Equity          
Non-cash compensation expense related to stock-based awards 5,701 $ 4,639 9,779 $ 8,577  
RSUs          
Stockholders' Equity          
Unrecognized compensation cost related to unvested awards $ 46,100   46,100    
Aggregate fair value of awards     $ 45,800    
Weighted-average period of recognition     1 year 4 months 24 days