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GOODWILL AND INTANGIBLE ASSETS - Acquired Technology - Additional Information (Details)
€ in Millions
3 Months Ended 9 Months Ended
Jun. 28, 2016
USD ($)
patent
Jun. 28, 2016
EUR (€)
patent
Jul. 23, 2012
USD ($)
patent
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Finite-Lived Intangible Assets [Line Items]              
Amortization related to acquired technology           $ 16,469,000 $ 16,479,000
Future amortization expense, remainder of 2019       $ 5,100,000   5,100,000  
Future amortization expense, 2020       20,600,000   20,600,000  
Future amortization expense, 2021       20,600,000   20,600,000  
Future amortization expense, 2022       15,800,000   15,800,000  
Future amortization expense, 2023       9,700,000   9,700,000  
Future amortization expense, thereafter       24,100,000   24,100,000  
Patent Technology [Member]              
Finite-Lived Intangible Assets [Line Items]              
Amortization related to acquired technology       $ 5,100,000 $ 5,100,000 $ 15,400,000 $ 15,400,000
Patents [Member] | FUJIFILM [Member]              
Finite-Lived Intangible Assets [Line Items]              
Number of patents acquired (more than) | patent     1,200        
Assigned value of acquired intangible assets     $ 105,000,000.0        
Cash paid for OLED patents     $ 4,500,000        
OLED patents useful life     10 years     10 years  
Patents [Member] | BASF [Member]              
Finite-Lived Intangible Assets [Line Items]              
Number of patents acquired (more than) | patent 500 500          
Assigned value of acquired intangible assets $ 95,800,000 € 86.8          
Cash paid for OLED patents $ 217,000            
OLED patents useful life 10 years 10 years       10 years