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Joint Ventures - Additional Information (Detail) shares in Millions	1 Months Ended	3 Months Ended			6 Months Ended		9 Months Ended
	Sep. 30, 2012 USD ($) shares	Jun. 30, 2018 USD ($) Project	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Sep. 30, 2017 USD ($)	Apr. 27, 2017	Oct. 31, 2016	Dec. 31, 2012 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity in net income/(loss) of joint venture		$ 0		$ 0	$ 22,000	$ 0
Net income (loss) attributable to non-controlling interests		$ (29,000)		55,000	$ 22,000	86,000
Pacific Animation Partners Joint Venture
Schedule of Equity Method Investments [Line Items]
Percentage of ownership interest in joint venture		50.00%			50.00%
Number of episodes for which production completed | Project		65
Episode show airing beginning date		2012-02
DreamPlay Toys
Schedule of Equity Method Investments [Line Items]
Percentage of ownership interest in joint venture	50.00%
Cash paid to Nant Works for joint venture	$ 8,000,000
Impairment charge							$ 7,000,000
Issue of warrants (in shares) | shares	1.5
Issue of warrants	$ 7,000,000
Investment in DreamPlay LLC										$ 7,000,000
Percentage of ownership interest in joint venture										5.00%
DreamPlay Toys | Technology Rights
Schedule of Equity Method Investments [Line Items]
Impairment charge			$ 2,900,000
China Joint Venture
Schedule of Equity Method Investments [Line Items]
Percentage of ownership interest in joint venture		51.00%			51.00%
Net income (loss) attributable to non-controlling interests		$ 29,000,000		55,000,000	$ 22,000,000	86,000,000
Hong Kong Meisheng Cultural Co
Schedule of Equity Method Investments [Line Items]
Percentage of ownership interest in joint venture									50.00%
Net income (loss) attributable to non-controlling interests		0		0	0	0
Hong Kong Meisheng Cultural Co | Minimum
Schedule of Equity Method Investments [Line Items]
Ownership percentage								10.00%
Video Game
Schedule of Equity Method Investments [Line Items]
Equity in net income/(loss) of joint venture		$ 200,000		$ 100,000	$ 200,000	$ 100,000

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