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Deposits - Schedule of Deposits (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024
Schedule of Deposits [Line Items] |  |
Total other receivables and other current assets, net | $ 30,918 | $ 29,888
Machinery Rental Deposit [Member] |  |
Schedule of Deposits [Line Items] |  |
Nature | Refundable |
Total other receivables and other current assets, net | $ 1,640 |
Public relations consulting services [Member] |  |
Schedule of Deposits [Line Items] |  |
Nature | Refundable |
Total other receivables and other current assets, net | $ 28,518 | 29,112
Photocopiers rent for offices use [Member] |  |
Schedule of Deposits [Line Items] |  |
Nature | Refundable |
Total other receivables and other current assets, net | $ 760 | $ 776

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- Definition Nature of deposit description. + References No definition available. + Details
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Namespace Prefix: | gti_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | gti_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Carrying value of amounts transferred to third parties for security purposes that are expected to be returned or applied towards payment within one year or during the operating cycle, if shorter. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(8)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |