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GOODWILL AND PURCHASED INTANGIBLE ASSETS - Schedule of Goodwill (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022
Goodwill [Line Items] |  |  |  |  |
Goodwill |  |  | $ 2,507,949,000 | $ 2,813,039,000 | $ 2,854,268,000
Accumulated impairment losses |  |  | (492,223,000) | (534,219,000) | (534,219,000)
Goodwill [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 2,278,820,000 | 2,320,049,000 |
Acquired goodwill |  |  |  | 6,776,000 |
Goodwill disposal from sale of business |  |  |  | (42,622,000) |
Goodwill adjustments |  |  |  | (5,337,000) |
Goodwill impairment |  |  | (263,074,000) | 0 |
Reallocation due to change in reporting units |  |  | 0 |  |
Foreign currency adjustments |  |  | (20,000) | (46,000) |
Ending balance |  |  | 2,015,726,000 | 2,278,820,000 |
Wafer Inspection and Patterning |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill |  |  | 1,004,680,000 | 1,004,700,000 | 1,003,307,000
Accumulated impairment losses |  |  | (277,570,000) | (277,570,000) | (277,570,000)
Goodwill [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 727,130,000 | 725,737,000 |
Acquired goodwill |  |  |  | 6,776,000 |
Goodwill disposal from sale of business |  |  |  | 0 |
Goodwill adjustments |  |  |  | (5,337,000) |
Goodwill impairment |  |  | 0 |  |
Reallocation due to change in reporting units |  |  | 0 |  |
Foreign currency adjustments |  |  | (20,000) | (46,000) |
Ending balance |  |  | 727,110,000 | 727,130,000 |
Global Service and Support (“GSS”) |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill |  |  | 25,908,000 | 25,908,000 | 25,908,000
Accumulated impairment losses |  |  | 0 | 0 | 0
Goodwill [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 25,908,000 | 25,908,000 |
Acquired goodwill |  |  |  | 0 |
Goodwill disposal from sale of business |  |  |  | 0 |
Goodwill adjustments |  |  |  | 0 |
Goodwill impairment |  |  | 0 |  |
Reallocation due to change in reporting units |  |  | 0 |  |
Foreign currency adjustments |  |  | 0 | 0 |
Ending balance |  |  | 25,908,000 | 25,908,000 |
Specialty Semiconductor Process |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill |  |  | 826,037,000 | 826,037,000 | 826,037,000
Accumulated impairment losses |  |  | (144,179,000) | (144,179,000) | (144,179,000)
Goodwill [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 681,858,000 | 681,858,000 |
Acquired goodwill |  |  |  | 0 |
Goodwill disposal from sale of business |  |  |  | 0 |
Goodwill adjustments |  |  |  | 0 |
Goodwill impairment |  |  | 0 |  |
Reallocation due to change in reporting units |  |  | 0 |  |
Foreign currency adjustments |  |  | 0 | 0 |
Ending balance |  |  | 681,858,000 | 681,858,000 |
PCB and Display |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill |  |  | 0 | 942,819,000 | 985,441,000
Accumulated impairment losses |  |  | 0 | (112,470,000) | (112,470,000)
Goodwill [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 830,349,000 | 872,971,000 |
Acquired goodwill |  |  |  | 0 |
Goodwill disposal from sale of business |  |  |  | (42,622,000) |
Goodwill adjustments |  |  |  | 0 |
Goodwill impairment |  | $ (192,600,000) | (192,600,000) |  |
Reallocation due to change in reporting units |  |  | (637,749,000) |  |
Foreign currency adjustments |  |  | 0 | 0 |
Ending balance |  |  | 0 | 830,349,000 |
PCB |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill |  |  | 567,275,000 | 0 | 0
Accumulated impairment losses |  |  | 0 | 0 | 0
Goodwill [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 0 | 0 |
Acquired goodwill |  |  |  | 0 |
Goodwill disposal from sale of business |  |  |  | 0 |
Goodwill adjustments |  |  |  | 0 |
Goodwill impairment |  |  | 0 |  |
Reallocation due to change in reporting units |  |  | 567,275,000 |  |
Foreign currency adjustments |  |  | 0 | 0 |
Ending balance |  |  | 567,275,000 | 0 |
Display |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill |  |  | 70,474,000 | 0 | 0
Accumulated impairment losses |  |  | (70,474,000) | 0 | 0
Goodwill [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 0 | 0 |
Acquired goodwill |  |  |  | 0 |
Goodwill disposal from sale of business |  |  |  | 0 |
Goodwill adjustments |  |  |  | 0 |
Goodwill impairment | $ (70,500,000) |  | (70,474,000) |  |
Reallocation due to change in reporting units |  |  | 70,474,000 |  |
Foreign currency adjustments |  |  | 0 | 0 |
Ending balance |  |  | 0 | 0 |
Component Inspection |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill |  |  | 13,575,000 | 13,575,000 | 13,575,000
Accumulated impairment losses |  |  | 0 | 0 | $ 0
Goodwill [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 13,575,000 | 13,575,000 |
Acquired goodwill |  |  |  | 0 |
Goodwill disposal from sale of business |  |  |  | 0 |
Goodwill adjustments |  |  |  | 0 |
Goodwill impairment |  |  |  |  |
Reallocation due to change in reporting units |  |  |  |  |
Foreign currency adjustments |  |  | 0 | 0 |
Ending balance |  |  | $ 13,575,000 | $ 13,575,000 |

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