Quarterly report pursuant to Section 13 or 15(d)

Financial Statement Components - Effects on Net Income (Loss) of Amounts Reclassified from AOCI (Details)

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Financial Statement Components - Effects on Net Income (Loss) of Amounts Reclassified from AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Mar. 31, 2020
Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss)                
Revenues $ 1,423,964     $ 1,097,311     $ 4,346,831 $ 3,310,469
Costs of revenues and operating expenses 1,248,000           3,297,788  
Interest expense 39,231     31,187     120,053 84,087
Interest and Other Income 1,004     9,282     5,190 28,535
Net income attributable to KLA 78,452 $ 380,555 $ 346,525 192,728 $ 369,100 $ 395,944 805,532 957,772
Unrealized Gains (Losses) on Defined Benefit Plans                
Accumulated Other Comprehensive Income (Loss)                
Other comprehensive (income) loss, reclassification adjustment from AOCI, pension and other postretirement benefit plans, net of tax 200     200     700 600
Reclassification out of accumulated other comprehensive income | Unrealized gains (losses) on cash flow hedges from foreign exchange and interest rate contracts                
Accumulated Other Comprehensive Income (Loss)                
Revenues 3,051 [1]     655 [1]     3,416 3,343
Costs of revenues and operating expenses 12 [1]     (17) [1]     (1,806) (309)
Interest expense (159) [1]     150 [1]     (358) 527
Interest and Other Income 0 [1]     158 [1]     0 158
Net income attributable to KLA 2,904 [1]     946 [1]     1,252 3,719
Reclassification out of accumulated other comprehensive income | Unrealized gains (losses) on available-for-sale securities                
Accumulated Other Comprehensive Income (Loss)                
Other expense (income), net $ (432)     $ (313)     $ (346) $ (1,263)
[1]
Reflects the new accounting guidance for hedge accounting, which was adopted in the second quarter of fiscal year 2019. For additional details, refer to Note 16 “Derivative Instruments and Hedging Activities” of the Notes to the Condensed Consolidated Financial Statements.