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LEASES - Supplemental cash flow information related to operating leases (Details)	12 Months Ended
	Dec. 31, 2022 CNY (¥)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 CNY (¥)	Dec. 31, 2020 CNY (¥)
LEASES
Cash paid for amounts included in the measurement of operating lease liabilities	¥ 2,381,173	$ 345,238	¥ 4,813,050	¥ 2,842,464

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- Definition

Amount of cash paid for amounts included in measurement of operating lease liabilities.

+ References

No definition available.

+ Details

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Namespace Prefix:	ncty_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

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