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FINANCIAL STATEMENT COMPONENTS - Effects on Net Income of Amounts Reclassified from AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 1,459,593 | $ 1,423,964 | $ 1,509,453 | $ 1,413,414 | $ 1,258,435 | $ 1,097,311 | $ 1,119,898 | $ 1,093,260 | $ 5,806,424 | $ 4,568,904 | $ 4,036,701
Costs of revenues and operating expenses |  |  |  |  |  |  |  |  | (2,449,561) | (1,869,377) | (1,446,041)
Interest expense |  |  |  |  |  |  |  |  | 160,274 | 124,604 | 114,376
Net income attributable to KLA | $ 411,253 | $ 78,452 | $ 380,555 | $ 346,525 | $ 217,845 | $ 192,728 | $ 369,100 | $ 395,944 | 1,216,785 | 1,175,617 | 802,265
Other expense (income), net |  |  |  |  |  |  |  |  | 2,678 | (31,462) | $ (30,482)
Unrealized Gains (Losses) on Defined Benefit Plans |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |
Amounts reclassified out of accumulated OCI |  |  |  |  |  |  |  |  | 1,200 | 1,100 |
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 |  |  |  |  |  |  |  |  | 4,086 | 4,329 |
Costs of revenues and operating expenses |  |  |  |  |  |  |  |  | (1,377) | (739) |
Interest expense |  |  |  |  |  |  |  |  | (637) | 424 |
Other expense (income), net |  |  |  |  |  |  |  |  | 0 | 4 |
Net income attributable to KLA |  |  |  |  |  |  |  |  | 2,072 | 4,018 |
Reclassification out of accumulated other comprehensive income | Unrealized gains (losses) on available-for-sale securities |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |
Other expense (income), net |  |  |  |  |  |  |  |  | $ 297 | $ (1,294) |

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