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Segment Information - Worldwide Revenues by Categories (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 | Dolls
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	567,598		538,368				1,093,890	1,062,357
Operating Segments | Infant, Toddler, and Preschool
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	430,973		483,424				876,595	998,072
Operating Segments | Vehicles
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	346,939		306,490				744,437	710,461
Operating Segments | Action Figures, Building Sets, and Games
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	311,400		278,354				684,380	589,877
Sales adjustments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ (175,353)		$ (169,185)				$ (368,436)	$ (370,238)

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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