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Loans from Third Parties - Schedule of Principal Amount, Maturity Date and Interest Rate for the Loans (Details) - USD ($) | Sep. 30, 2025 | Sep. 30, 2024
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Loans from Third Parties [Abstract] |  |
Total interest payable | $ 7,949 | $ 66,905
Total debt and interest payable | $ 55,478 | $ 600,626

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- Definition The amount of loans from third parties. + References No definition available. + Details
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Namespace Prefix: | gti_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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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
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