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PROPERTY, EQUIPMENT AND SOFTWARE, NET - Additional Information (Details)	12 Months Ended
	Dec. 31, 2022 CNY (¥)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 CNY (¥)	Dec. 31, 2020 CNY (¥)
Property, equipment and software, net
Depreciation and amortization of property, equipment and software	¥ 91,380,588	$ 13,248,940	¥ 47,435,448	¥ 447,782
Gain (Loss) on Disposition of Property Plant Equipment	8,800,000	1,300,000	3,900,000	30,000.00
Impairment on equipment	176,900,000	25,600,000	11,600,000	0
Cost of revenues
Property, equipment and software, net
Depreciation and amortization charges	45,400,000	6,600,000	16,600,000	0
General and administrative expense
Property, equipment and software, net
Depreciation and amortization charges	¥ 46,000,000.0	$ 6,600,000	¥ 30,800,000	¥ 400,000

X

- Definition

The amount of current period expense charged against earnings on property, equipment and software.

+ References

No definition available.

+ Details

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Namespace Prefix:	ncty_
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Period Type:	duration

X

- Definition

It represents the amount of long-lived assets on equipment .

+ References

No definition available.

+ Details

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Namespace Prefix:	ncty_
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X

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (e)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

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X

- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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- Details

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