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SEGMENT REPORTING AND GEOGRAPHIC INFORMATION - Reconciliation of Total Segment Gross Margin to Total Income Before Income Taxes (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
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total segment gross margin | $ 838,049 | $ 833,806 | $ 875,835 | $ 809,173 | $ 665,650 | $ 610,366 | $ 711,638 | $ 711,873 |  |  |
Research and development |  |  |  |  |  |  |  |  | $ 863,864 | $ 711,030 | $ 608,531
Selling, general and administrative |  |  |  |  |  |  |  |  | 734,149 | 599,124 | 442,304
Goodwill impairment |  |  |  |  |  |  |  |  | 256,649 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  | 160,274 | 124,604 | 114,376
Loss on extinguishment of debt |  |  |  |  |  |  |  |  | 22,538 | 0 | 0
Other expense (income), net |  |  |  |  |  |  |  |  | 2,678 | (31,462) | (30,482)
Income before income taxes |  |  |  |  |  |  |  |  | 1,316,711 | 1,296,231 | 1,455,931
Operating segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total segment gross margin |  |  |  |  |  |  |  |  | 3,527,468 | 2,826,101 | 2,592,651
Corporate and segment reconciling items |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquisition-related charges, corporate allocation, and effects of foreign exchange rates |  |  |  |  |  |  |  |  | $ 170,605 | $ 126,574 | $ 1,991

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