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GOODWILL AND PURCHASED INTANGIBLE ASSETS - Additional Information (Details) $ in Millions | 3 Months Ended
--- | ---
Sep. 30, 2020 segment reporting_unit | Mar. 31, 2020 USD ($)
Goodwill [Line Items] |  |
Number of reportable segments | segment | 4 |
Number of reporting units | reporting_unit | 6 |
Specialty Semiconductor Process |  |
Goodwill [Line Items] |  |
Goodwill impairment |  | $ 144.2
PCB and Display |  |
Goodwill [Line Items] |  |
Goodwill impairment |  | $ 112.5

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