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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, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 1,070,004 |  | $ 1,021,294 |  | $ 975,822 |  | $ 969,581 |  | $ 938,647 | $ 913,809 | $ 876,885 | $ 750,673 | $ 4,036,701 | $ 3,480,014 | $ 2,984,493
Costs of revenues |  |  |  |  |  |  |  |  |  |  |  |  | (1,447,369) | (1,287,547) | (1,163,391)
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 114,376 | 122,476 | 122,887
Net income | $ 348,767 | [1] | $ 306,881 | [1] | $ (134,319) | [1] | $ 280,936 | [1] | $ 256,162 | $ 253,562 | $ 238,251 | $ 178,101 | 802,265 | 926,076 | 704,422
Other expense (income), net |  |  |  |  |  |  |  |  |  |  |  |  | (33,113) | (19,461) | $ (20,634)
Other comprehensive (income) loss, reclassification adjustment from AOCI, pension and other postretirement benefit plans, net of tax |  |  |  |  |  |  |  |  |  |  |  |  | 1,800 | 1,900 |
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 |  |  |  |  |  |  |  |  |  |  |  |  | 955 | 2,846 |
Costs of revenues |  |  |  |  |  |  |  |  |  |  |  |  | 2,137 | (378) |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 754 | 754 |
Net income |  |  |  |  |  |  |  |  |  |  |  |  | 3,846 | 3,222 |
Reclassification out of accumulated other comprehensive income | Unrealized gains (losses) on available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other expense (income), net |  |  |  |  |  |  |  |  |  |  |  |  | $ (209) | $ 191 |
[1] | The Company had 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.

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