XML 216 R87.htm IDEA: XBRL DOCUMENT
v3.25.4

Summary of Significant Accounting Policies - Schedule of Translation of Foreign Currencies Exchange Rates (Details) | Jun. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2024
--- | --- | --- | ---
Period-end RM: US$1 Exchange Rate [Member] |  |  |
Schedule of Translation of Foreign Currencies Exchange Rates [Line Items] |  |  |
Translation of foreign currencies | 4.2125 | 4.122 |
Period-average RM: US$1 Exchange Rate [Member] |  |  |
Schedule of Translation of Foreign Currencies Exchange Rates [Line Items] |  |  |
Translation of foreign currencies | 4.3842 |  | 4.7175

X
- Definition Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481674/830-30-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479424/830-30-S99-1 + Details
Name: | us-gaap_ForeignCurrencyExchangeRateTranslation1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- 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
Name: | us-gaap_IntercompanyForeignCurrencyBalanceLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis=gti_PeriodendRMUS1ExchangeRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis=gti_PeriodaverageRMUS1ExchangeRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |