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Income Taxes - Schedule of Movement of Valuation Allowance (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Schedule of Movement of Valuation Allowance [Abstract] |  |
Balance at beginning of the year | $ 4,511,773 | $ 281,826
Amount disregarded due to substantial change in shareholding | (281,826) |
Current year statutory income utilized against brought forward business losses | (1,066,424) |
Addition | 79,228 | 4,229,947
Balance at end of the year | $ 3,242,751 | $ 4,511,773

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- Definition The amount of deferred tax asset additions. + References No definition available. + Details
Name: | gti_DeferredTaxAssetValuationAllowanceAddition
Namespace Prefix: | gti_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount disregarded due to substantial change in shareholding. + References No definition available. + Details
Name: | gti_DeferredTaxValuationAllowanceAmountDisregardedDueToSubstantialChangeInShareholding
Namespace Prefix: | gti_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Current year statutory income utilized against brought forward business losses. + References No definition available. + Details
Name: | gti_DeferredTaxValuationAllownceCurrentYearStatutoryIncomeUtilizedAgainstBroughtForwardBusinessLosses
Namespace Prefix: | gti_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant