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STOCK-BASED COMPENSATION (Details)
$ in Thousands
12 Months Ended
Sep. 30, 2015
USD ($)
Stock-Based Compensation  
Non-cash compensation expense related to stock-based awards $ 8,325
Estimated forfeiture rate (as a percent) 12.50%
RSUs  
Stock-Based Compensation  
Unrecognized compensation cost related to unvested awards $ 25,400
Aggregate fair value of awards $ 13,800
Weighted-average period of recognition 1 year 8 months 12 days
RSUs | Cost of sales  
Stock-Based Compensation  
Non-cash compensation expense related to stock-based awards $ 754
RSUs | Selling, general and administrative  
Stock-Based Compensation  
Non-cash compensation expense related to stock-based awards $ 7,571