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 6 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss)            
Revenues $ 1,509,453   $ 1,119,898   $ 2,922,867 $ 2,213,158
Costs of revenues and operating expenses 1,046,622       2,049,788  
Interest expense 40,472   26,538   80,822 52,900
Net income attributable to KLA 380,555 $ 346,525 369,100 $ 395,944 727,080 765,044
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   500 400
Reclassification out of accumulated other comprehensive income | Unrealized gains (losses) on available-for-sale securities            
Accumulated Other Comprehensive Income (Loss)            
Other expense (income), net (82)   (469)   (86) (950)
Accounting Standards Update 2017-12 | 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 (8) [1]   1,705 [1]   365 2,688 [1]
Costs of revenues and operating expenses (17) [1]   (158) [1]   (1,818) (292) [1]
Interest expense (100) [1]   189 [1]   (199) 377 [1]
Net income attributable to KLA $ (125) [1]   $ 1,736 [1]   $ (1,652) $ 2,773 [1]
[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 Condensed Consolidated Financial Statements.