Annual report pursuant to Section 13 and 15(d)

BUSINESS COMBINATIONS - Fiscal 2019 Acquisitions (Details)

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BUSINESS COMBINATIONS - Fiscal 2019 Acquisitions (Details) - USD ($)
$ in Thousands, shares in Billions
 3 Months Ended 12 Months Ended
Feb. 20, 2019
Dec. 24, 2018
Dec. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Business Acquisition [Line Items]          
Goodwill adjustments       $ 34,134  
Orbotech          
Business Acquisition [Line Items]          
Total purchase consideration $ 3,260,000        
Payment for acquisition 2,000,000        
Cash and cash equivalents $ 216,000        
Shares of common stock issued in acquisition (in shares) 12        
Fair value of KLA-Tencor common stock issued for outstanding Orbotech shares $ 1,000,000        
Stock options and RSUs assumed $ 13,000        
Revenue of acquiree since acquisition         $ 388,900
Net loss of acquiree since acquisition         61,600
Acquired intangible assets, adjustments     $ 75,500 2,100  
Trade accounts receivable, adjustments     21,500    
Non-controlling interest, adjustments     17,400    
Other immaterial adjustments     6,100 10,400  
Impacts on deferred income tax liabilities, adjustments     $ 47,500 8,800  
Additional reserves for uncertain tax positions, adjustments       16,900  
Goodwill adjustments       $ 34,000 $ 38,200
Orbotech | Frontline          
Business Acquisition [Line Items]          
Payment for acquisition   $ 85,000      
Percentage of outstanding shares acquired   50.00%      
Purchase consideration, liability incurred   $ 10,000      
Purchase consideration, liability incurred, payment term   4 years      
Cash earn-out, minimum   $ 5,000      
Contingent consideration (up to)   20,000      
Contingent consideration, deferred cash payments   4,600      
Contingent consideration, earn-out   2,500      
Contingent consideration, current   2,400      
Contingent consideration, non-current   $ 4,700