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v3.20.2

Restricted Net Assets (Details) | 12 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019
Parent Company [Member] |  |
Restricted Net Assets (Details) [Line Items] |  |
Subsidiaries net assets, percentage | 25.00% | 25.00%

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

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

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=srt_ParentCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |