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Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Property, Plant and Equipment Useful Life (Details)	Sep. 30, 2023
Buildings Including Salt Pans [Member] | Minimum
Property, Plant and Equipment [Line Items]
Useful life (in years)	8 years
Buildings Including Salt Pans [Member] | Maximum
Property, Plant and Equipment [Line Items]
Useful life (in years)	20 years
Plant And Machinery [Member] | Minimum
Property, Plant and Equipment [Line Items]
Useful life (in years)	3 years
Plant And Machinery [Member] | Maximum
Property, Plant and Equipment [Line Items]
Useful life (in years)	8 years
Motor Vehicles
Property, Plant and Equipment [Line Items]
Useful life (in years)	5 years
Furnitire Fixtures And Equipment [Member] | Minimum
Property, Plant and Equipment [Line Items]
Useful life (in years)	3 years
Furnitire Fixtures And Equipment [Member] | Maximum
Property, Plant and Equipment [Line Items]
Useful life (in years)	8 years

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

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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- Details

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- Details

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X

- Details

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X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=gure_PlantAndMachineryMember
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X

- Details

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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=gure_FurnitireFixturesAndEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: