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GOODWILL AND PURCHASED INTANGIBLE ASSETS - Additional Information (Details) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 28, 2025 USD ($) | Feb. 29, 2024 USD ($) | Dec. 31, 2024 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) reporting_unit | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($)
Goodwill [Line Items] |  |  |  |  |  |  |  |
Impairment of goodwill and purchased intangible assets | $ 0 | $ 0 |  |  |  | $ 230,400,000 | $ 263,074,000 |
Number of reporting units | reporting_unit |  |  |  |  | 2 |  |  |
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Purchased intangible assets, net |  | Purchased intangible assets, net |  |  |
Impairment charge |  |  | $ 8,700,000 |  | $ 26,400,000 |  |  |
Impairment of goodwill and purchased intangible assets |  |  | 239,100,000 |  | 219,000,000.0 | 239,100,000 | 289,474,000 | $ 0
Impairment of intangible assets |  |  |  |  |  | 0 | 0 |
Amortization expense |  |  |  |  |  | 220,400,000 | 239,300,000 | 260,600,000
Specialty Semiconductor Process |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |
Impairment of goodwill and purchased intangible assets |  |  | 0 |  |  | 0 | 0 |
Goodwill accumulated impairment loss |  |  |  |  |  |  | 144,200,000 | 144,200,000
Semiconductor Process Control |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |
Impairment of goodwill and purchased intangible assets |  |  |  |  |  | 0 | 0 |
Goodwill accumulated impairment loss |  |  |  |  |  | 277,600,000 | 277,600,000 | 277,600,000
PCB and Component Inspection |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |
Impairment of goodwill and purchased intangible assets |  |  |  |  |  | 230,400,000 | 263,074,000 |
Goodwill accumulated impairment loss |  |  |  |  |  | $ 70,500,000 | $ 70,500,000 | $ 112,500,000
PCB |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |
Impairment of goodwill and purchased intangible assets |  |  | $ 230,400,000 |  |  |  |  |
PCB And Display |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |
Impairment of goodwill and purchased intangible assets |  |  |  |  | $ 192,600,000 |  |  |
PCB And Display | Valuation, Income Approach |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |
Reporting unit, percentage of fair value |  |  |  |  |  | 75.00% |  |
PCB And Display | Valuation, Market Approach |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |
Reporting unit, percentage of fair value |  |  |  |  |  | 25.00% |  |
Display |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |
Impairment of goodwill and purchased intangible assets |  |  |  | $ 70,500,000 |  |  |  |

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