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Stock-Based Compensation (Details) (USD $)
3 Months Ended 6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Stock-Based Compensation        
Non-cash compensation expense related to stock-based awards $ 1,725,000 $ 59,000 $ 2,585,000 $ 59,000
Estimated forfeiture rate (as a percent)     12.50%  
RSUs
       
Stock-Based Compensation        
Unrecognized compensation cost related to unvested awards 26,300,000   26,300,000  
Weighted-average period of recognition     1 year 8 months 12 days  
Aggregate fair value of awards     17,000,000  
RSUs | Cost of sales
       
Stock-Based Compensation        
Non-cash compensation expense related to stock-based awards 144,000 4,000 205,000 4,000
RSUs | Selling, general and administrative
       
Stock-Based Compensation        
Non-cash compensation expense related to stock-based awards $ 1,581,000 $ 55,000 $ 2,380,000 $ 55,000