Annual report pursuant to Section 13 and 15(d)

QUARTERLY CONSOLIDATED RESULTS OF OPERATIONS (UNAUDITED) (Details)

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QUARTERLY CONSOLIDATED RESULTS OF OPERATIONS (UNAUDITED) (Details) - USD ($)
3 Months Ended 12 Months Ended
Apr. 24, 2020
Feb. 20, 2019
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Quarterly Financial Information Disclosure [Abstract]                          
Total revenues     $ 1,459,593,000 $ 1,423,964,000 $ 1,509,453,000 $ 1,413,414,000 $ 1,258,435,000 $ 1,097,311,000 $ 1,119,898,000 $ 1,093,260,000 $ 5,806,424,000 $ 4,568,904,000 $ 4,036,701,000
Gross margin     838,049,000 833,806,000 875,835,000 809,173,000 665,650,000 610,366,000 711,638,000 711,873,000      
Net income attributable to KLA     $ 411,253,000 $ 78,452,000 $ 380,555,000 $ 346,525,000 $ 217,845,000 $ 192,728,000 $ 369,100,000 $ 395,944,000 $ 1,216,785,000 $ 1,175,617,000 $ 802,265,000
Net income (loss) attributable to KLA per share:                          
Basic (in dollars per share)     $ 2.65 $ 0.50 $ 2.42 $ 2.18 $ 1.36 $ 1.23 $ 2.43 $ 2.55 $ 7.76 $ 7.53 $ 5.13
Diluted (in dollars per share)     $ 2.63 $ 0.50 $ 2.40 $ 2.16 $ 1.35 $ 1.23 $ 2.42 $ 2.54 $ 7.70 $ 7.49 $ 5.10
Business Acquisition                          
Total purchase consideration $ 11,400,000                        
Orbotech                          
Business Acquisition                          
Total purchase consideration   $ 3,260,000,000