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EMPLOYEE BENEFITS (Details) $ in Thousands, ¥ in Millions	12 Months Ended
	Dec. 31, 2022 CNY (¥)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 CNY (¥)	Dec. 31, 2020 CNY (¥)
EMPLOYEE BENEFITS
Employee benefits expenses related to full-time employees of subsidiaries and VIE subsidiaries incorporated in PRC	¥ 6.4	$ 930	¥ 4.1	¥ 1.2

X

- Definition

n/a.

+ References

No definition available.

+ Details

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Namespace Prefix:	ncty_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Amount of cost (reversal of cost) for pension and other postretirement benefits.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration