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Accrued and Other Liabilities - Additional Information (Details) $ in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2024 CAD ($)	Sep. 30, 2024 USD ($)	Oct. 02, 2023
Assets Acquisition of Amika Mobile Corporation [Member]
Asset purchase agreement, deduction from liability	$ 1,000	$ 736
Asset purchase agreement, deduction, term (year)			3 years
Minimum [Member]
Extended product warranty term (year)	1 year	1 year
Maximum [Member]
Extended product warranty term (year)	2 years	2 years

X

- Definition

The amount of deduction from liabilities under an asset purchase agreement.

+ References

No definition available.

+ Details

Name:	gnss_AssetPurchaseAgreementDeductionFromLiability
Namespace Prefix:	gnss_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The period of time that deductions can be made under an asset purchase agreement.

+ References

No definition available.

+ Details

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

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:	us-gaap_BusinessAcquisitionAxis=gnss_AssetsAcquisitionOfAmikaMobileCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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: