Annual report [Section 13 and 15(d), not S-K Item 405]

GOODWILL AND PURCHASED INTANGIBLE ASSETS - Schedule of Goodwill (Details)

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GOODWILL AND PURCHASED INTANGIBLE ASSETS - Schedule of Goodwill (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2025
Feb. 29, 2024
Dec. 31, 2024
Jun. 30, 2026
Jun. 30, 2025
Goodwill [Roll Forward]          
Beginning balance       $ 1,792,193,000 $ 2,015,726,000
Goodwill impairment $ 0 $ 0     230,400,000
Foreign currency adjustments       (3,435,000) 6,867,000
Ending balance       1,788,758,000 $ 1,792,193,000
Goodwill Impairment Loss Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag         Goodwill impairment
Semiconductor Process Control          
Goodwill [Roll Forward]          
Beginning balance       759,885,000 $ 753,018,000
Goodwill impairment         0
Foreign currency adjustments       (1,669,000) 6,867,000
Ending balance       758,216,000 759,885,000
Specialty Semiconductor Process          
Goodwill [Roll Forward]          
Beginning balance       681,858,000 681,858,000
Goodwill impairment     $ 0   0
Foreign currency adjustments       (768,000) 0
Ending balance       681,090,000 681,858,000
PCB and Component Inspection          
Goodwill [Roll Forward]          
Beginning balance       350,450,000 580,850,000
Goodwill impairment         230,400,000
Foreign currency adjustments       (998,000) 0
Ending balance       $ 349,452,000 $ 350,450,000