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v3.25.1

Accrued and Other Liabilities - Additional information (Details) $ in Thousands | 6 Months Ended
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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

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- 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

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- 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

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

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

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