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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Stock-Based Compensation        
Non-cash compensation expense related to stock-based awards $ 2,603 $ 395 $ 5,100 $ 3,586
Estimated forfeiture rate (as a percent)     12.50%  
Cost of sales        
Stock-Based Compensation        
Non-cash compensation expense related to stock-based awards 357 129 $ 729 412
Selling, general and administrative        
Stock-Based Compensation        
Non-cash compensation expense related to stock-based awards 2,246 $ 266 4,371 $ 3,174
RSUs        
Stock-Based Compensation        
Unrecognized compensation cost related to unvested awards $ 43,500   43,500  
Aggregate fair value of awards     $ 23,500  
Weighted-average period of recognition     1 year 8 months 12 days