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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical)	Dec. 31, 2025
CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY
Acquisition of non-controlling interest (percent)	49.00%

X

- Definition

Percentage of interest acquired from non-controlling interest.

+ References

No definition available.

+ Details

Name:	ncty_PercentageOfInterestAcquiredFromNonControllingInterest
Namespace Prefix:	ncty_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_StatementOfStockholdersEquityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration