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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Stock-Based Compensation        
Non-cash compensation expense related to stock-based awards $ 469 $ 2,828 $ 3,826 $ 6,916
Estimated forfeiture rate (as a percent)     12.50%  
Cost of sales        
Stock-Based Compensation        
Non-cash compensation expense related to stock-based awards 129 312 $ 412 856
Selling, general and administrative        
Stock-Based Compensation        
Non-cash compensation expense related to stock-based awards 340 $ 2,516 3,414 $ 6,060
RSUs        
Stock-Based Compensation        
Unrecognized compensation cost related to unvested awards $ 40,500   40,500  
Aggregate fair value of awards     $ 20,000  
Weighted-average period of recognition     1 year 8 months 12 days