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Accrued and Other Liabilities - Additional information (Details) $ in Thousands	6 Months Ended
	Mar. 31, 2025 USD ($)
Minimum [Member]
Accrued and Other Liabilities [Line items]
Extended product warranty term (year)	1 year
Maximum [Member]
Accrued and Other Liabilities [Line items]
Extended product warranty term (year)	2 years
Puerto Rico Project [Member]
Accrued and Other Liabilities [Line items]
Customer deposits	$ 9,735

X

- Definition

Accrued and Other Liabilities.

+ References

No definition available.

+ Details

Name:	gnss_AccruedAndOtherLiabilitiesLineItems
Namespace Prefix:	gnss_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Customer deposits

+ References

No definition available.

+ Details

Name:	gnss_CustomerDeposits
Namespace Prefix:	gnss_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents term of extended product warranty.

+ References

No definition available.

+ Details

Name:	gnss_ExtendedProductWarrantyTerm
Namespace Prefix:	gnss_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_PR
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: