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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.

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