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Segment Information - Worldwide Revenues by Top 3 Power Brands (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 1,481,557 | $ 689,246 | $ 1,437,451 | $ 844,706 | $ 1,549,309 | $ 1,553,078 | $ 3,030,866 | $ 2,990,529
Operating Segments |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Revenues | 1,656,910 |  | 1,606,636 |  |  |  | 3,399,302 | 3,360,767
Operating Segments | Barbie |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Revenues | 412,840 |  | 374,707 |  |  |  | 762,849 | 698,131
Operating Segments | Hot Wheels |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Revenues | 293,295 |  | 234,993 |  |  |  | 619,030 | 547,239
Operating Segments | Fisher-Price and Thomas & Friends |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Revenues | 396,339 |  | 409,497 |  |  |  | 791,146 | 833,468
Operating Segments | Other |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Revenues | 554,436 |  | 587,439 |  |  |  | 1,226,277 | 1,281,929
Sales adjustments |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Revenues | $ (175,353) |  | $ (169,185) |  |  |  | $ (368,436) | $ (370,238)

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