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Joint Ventures (Details) shares in Millions	1 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended
Joint Ventures (Details) shares in Millions	Sep. 30, 2012 USD ($) shares	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2019 USD ($)	Mar. 31, 2017	Oct. 31, 2016	Nov. 30, 2014
Joint Ventures (Details) [Line Items]
Income (Loss) from Equity Method Investments		$ 0	$ 0		$ 2,000	$ 0
Net Income (Loss) Attributable to Noncontrolling Interest		$ 49,000	(31,000)		$ 97,000	57,000
Pacific Animation Partners Joint Venture [Member]
Joint Ventures (Details) [Line Items]
Equity Method Investment, Ownership Percentage		50.00%			50.00%
Number of Projects Completed					65
Income (Loss) from Equity Method Investments					$ 2,000
Equity Method Investments
DreamPlay Toys [Member]
Joint Ventures (Details) [Line Items]
Equity Method Investment, Ownership Percentage	50.00%
Payments to Acquire Interest in Joint Venture	$ 8,000,000.0
DreamPlay, LLC [Member]
Joint Ventures (Details) [Line Items]
Equity Method Investment, Ownership Percentage							5.00%
Payments to Acquire Interest in Joint Venture							$ 7,000,000.0
Other than Temporary Impairment Losses, Investments				$ 7,000,000.0
Joint Venture With Meisheng Cultural & Creative Corp. [Member]
Joint Ventures (Details) [Line Items]
Equity Method Investment, Ownership Percentage											51.00%
Net Income (Loss) Attributable to Noncontrolling Interest		49,000	(31,000)		97,000	57,000
Technology Rights [Member] \| DreamPlay Toys [Member]
Joint Ventures (Details) [Line Items]
Other than Temporary Impairment Losses, Investments				$ 2,900,000
Nant Works [Member] \| DreamPlay Toys [Member]
Joint Ventures (Details) [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares) \| shares	1.5
Cost Method Investments	$ 7,000,000.0
Hong Kong Meisheng Cultural Co [Member]
Joint Ventures (Details) [Line Items]
Equity Method Investment, Ownership Percentage										50.00%
Net Income (Loss) Attributable to Noncontrolling Interest
Related Party Transaction, Purchases from Related Party		31,400,000	49,600,000		54,400,000	74,800,000
Due to Related Parties		$ 22,100,000	$ 18,100,000		$ 22,100,000	$ 18,100,000
Hong Kong Meisheng Cultural Co [Member] \| Minimum [Member] \| JAKKS Pacific [Member]
Joint Ventures (Details) [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners		10.00%			10.00%				10.00%