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Income Taxes - Schedule of Movement of Valuation Allowance (Details) - USD ($)	9 Months Ended	12 Months Ended
	Jun. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Schedule of Movement of Valuation Allowance [Abstract]
Balance at beginning of the year	$ 4,511,773	$ 281,826
Addition	514,856	4,229,947	281,826
Balance at end of the year	$ 5,026,629	$ 4,511,773	$ 281,826

X

- Definition

Amount of increase in allowance for credit loss additions.

+ References

No definition available.

+ Details

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Namespace Prefix:	gti_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Amount of allowance for credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Section 50
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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