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Concentrations and Litigation (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2020
Concentrations and Litigation (Details) [Line Items] |  |  |
Raw materials percentage |  | 65.80% |
Total purchase (in Dollars) |  | $ 38,276,289 |
Number of customers percentage | 10.00% | 10.00% |
Supplier Concentration Risk [Member] | One Vendor [Member] |  |  |
Concentrations and Litigation (Details) [Line Items] |  |  |
Concentration risk, percentage | 10.00% |  | 10.00%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References No definition available. + Details
Name: | cga_ConcentrationRiskPercentage
Namespace Prefix: | cga_
Data Type: | dtr:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | cga_ConcentrationsandLitigationDetailsLineItems
Namespace Prefix: | cga_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | cga_NumberOfCustomersPercentage
Namespace Prefix: | cga_
Data Type: | dtr:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Total purchase of raw material. + References No definition available. + Details
Name: | cga_RawMaterialPurchase
Namespace Prefix: | cga_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Raw materials percentage. + References No definition available. + Details
Name: | cga_RawMaterialsPercentage
Namespace Prefix: | cga_
Data Type: | dtr:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_SupplierConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_MajorCustomersAxis=cga_OneVendorsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |