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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - CNY (¥) ¥ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
CONSOLIDATED STATEMENTS OF CASH FLOWS
Deferred loan costs	¥ 3.5	¥ 0.9

X

- Definition

The amount of deferred loan costs incurred during the period from bitcoin mortgage borrowing in a non-cash transaction.

+ References

No definition available.

+ Details

Name:	ncty_DeferredLoanCostsIncurredFromBitcoinMortgageBorrowing
Namespace Prefix:	ncty_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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