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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, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Amortization Of Intangible Assets |  |  |  |  |  | $ 16,490,000 | $ 16,474,000
Patent Technology [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Amortization Of Intangible Assets |  |  |  | $ 5,100,000 | $ 5,100,000 | 15,400,000 | $ 15,400,000
Future amortization expense, 2021 |  |  |  | 5,100,000 |  | 5,100,000 |
Future amortization expense, 2022 |  |  |  | 15,800,000 |  | 15,800,000 |
Future amortization expense, 2023 |  |  |  | 9,700,000 |  | 9,700,000 |
Future amortization expense, 2024 |  |  |  | 9,600,000 |  | 9,600,000 |
Future amortization expense, 2025 |  |  |  | 9,600,000 |  | 9,600,000 |
Future amortization expense, thereafter |  |  |  | $ 5,000,000.0 |  | $ 5,000,000.0 |
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 |

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