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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, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 1,258,435 | [1],[2] | $ 1,097,311 | [1],[2] | $ 1,119,898 | [1],[2] | $ 1,093,260 | [1],[2] | $ 1,070,004 |  | $ 1,021,294 |  | $ 975,822 |  | $ 969,581 |  | $ 4,568,904 | $ 4,036,701 | $ 3,480,014
Costs of revenues and operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,869,377) | (1,446,041) | (1,286,215)
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 124,604 | 114,376 | 122,476
Other expense (income), net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (31,462) | (30,482) | (16,822)
Net income attributable to KLA |  | $ 217,845 |  | $ 192,728 |  | $ 369,100 |  | $ 395,944 |  | $ 348,767 | [3] | $ 306,881 | [3] | $ (134,319) | [3] | $ 280,936 | [3] | 1,175,617 | 802,265 | 926,076
Other expense (income), net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (31,462) | (30,482) | $ (16,822)
Unrealized Gains (Losses) on Defined Benefit Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts reclassified out of accumulated OCI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,100 | 1,800 |
Reclassification out of accumulated other comprehensive income | Unrealized gains (losses) on cash flow hedges from foreign exchange and interest rate contracts(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | [4] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,329 | 955 |
Costs of revenues and operating expenses | [4] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (739) | 2,137 |
Interest expense | [4] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 424 | 754 |
Other expense (income), net | [4] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 | 0 |
Net income attributable to KLA | [4] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,018 | 3,846 |
Reclassification out of accumulated other comprehensive income | Unrealized gains (losses) on available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other expense (income), net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,294) | $ (209) |
[1] | On February 20, 2019, we completed the acquisition of Orbotech for total consideration of approximately $3.26 billion. The operating results of Orbotech have been included in our Consolidated financial statements for the fiscal year ended June 30, 2019 from the Acquisition Date. For additional details, refer to Note 6 “Business Combinations” to our Consolidated Financial Statements.
[2] | On July 1, 2018, we adopted ASC 606 using the modified retrospective transition approach. Results for reporting periods beginning after June 30, 2018 are presented under ASC 606, while prior period amounts are not adjusted and continue to be reported in accordance with the previous revenue guidance in ASC 605.
[3] | We had a net loss of $134.3 million in the second quarter of the fiscal year ended June 30, 2018, primarily as a result of the income tax effects from the enacted tax reform legislation through the Tax Cuts and Jobs Act, which was signed into law on December 22, 2017.
[4] | Reflects the adoption of the new accounting guidance for hedge accounting in the second quarter of fiscal year 2019. For additional details, refer to Note 16, “Derivative Instruments and Hedging Activities.”

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