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Loans from Third Parties - Schedule of Principal Amount, Maturity Date and Interest Rate for the Loans (Details) - USD ($)	Jun. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Schedule of Obtained Loans from External Parties [Abstract]
Total interest payable	$ 84,998	$ 66,905	$ 35,482
Total debt and interest payable	$ 607,253	$ 600,626	$ 510,234

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- Definition

The amount of loans from third parties.

+ References

No definition available.

+ Details

Name:	gti_LoansFromThirdParties
Namespace Prefix:	gti_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(20))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_InterestPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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