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EMPLOYEE BENEFITS (Details) ¥ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2025 CNY (¥)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 CNY (¥)	Dec. 31, 2023 CNY (¥)
EMPLOYEE BENEFITS
Employee benefits expenses related to full-time employees of subsidiaries and VIE subsidiaries incorporated in PRC	¥ 3.6	$ 0.5	¥ 4.4	¥ 5.5

X

- Definition

n/a.

+ References

No definition available.

+ Details

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

X

- Definition

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

+ References

No definition available.

+ Details

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