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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, 2020 | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |
Revenues | $ 1,650,870 |  | $ 1,509,453 |  | $ 3,189,490 | $ 2,922,867
Costs of revenues and operating expenses | (1,080,706) |  | (1,046,622) |  | (2,092,937) | (2,049,788)
Interest expense | (38,880) |  | (40,472) |  | (78,266) | (80,822)
Net gains (losses) reclassified from accumulated OCI | 457,251 | $ 420,567 | 380,555 | $ 346,525 | 877,818 | 727,080
Other expense (income), net | 3,882 |  | (2,568) |  | 7,079 | (4,186)
Unrealized Gains (Losses) on Defined Benefit Plans |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |
Reclassification adjustment from AOCI, net of tax | 300 |  | 200 |  | 500 | 500
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 | (711) |  | (8) |  | (928) | 365
Costs of revenues and operating expenses | (125) |  | (17) |  | 425 | (1,818)
Interest expense | (279) |  | (100) |  | (558) | (199)
Net gains (losses) reclassified from accumulated OCI | (1,115) |  | (125) |  | (1,061) | (1,652)
Reclassification out of accumulated other comprehensive income | Unrealized gains (losses) on available-for-sale securities |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |
Other expense (income), net | $ (111) |  | $ (82) |  | $ (212) | $ (86)

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