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FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Sep. 30, 2016
Assets:    
Cash equivalents $ 78,265 $ 435
Short-term investments 14,874  
Deferred compensation 5,766 5,773
Liabilities:    
Deferred compensation 4,567 4,449
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Cash equivalents 78,265 435
Short-term investments 14,874  
Deferred compensation 782 1,643
Liabilities:    
Deferred compensation 0 0
Significant Other Observable Inputs (Level 2)    
Assets:    
Cash equivalents 0 0
Short-term investments 0  
Deferred compensation 4,984 4,130
Liabilities:    
Deferred compensation 4,567 4,449
Significant Unobservable Inputs (Level 3)    
Assets:    
Cash equivalents 0 0
Short-term investments 0  
Deferred compensation 0 0
Liabilities:    
Deferred compensation $ 0 $ 0