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Prepaid Expenses and Other - Additional Information (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Sep. 30, 2024
Deposits for inventory	$ 2,015	$ 4
Puerto Rico Project [Member]
Deposits for inventory	$ 1,832
Minimum [Member]
Capitalized contract cost, amortization period	3 years
Maximum [Member]
Capitalized contract cost, amortization period	5 years

X

- Definition

Represents amount of asset related to consideration paid in advance for deposits for inventory that provides economic benefits.

+ References

No definition available.

+ Details

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Namespace Prefix:	gnss_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amortization period of cost capitalized in obtaining or fulfilling contract with customer, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-SubTopic 40
-Topic 340
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479483/340-40-50-2

+ Details

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Balance Type:	na
Period Type:	instant

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- Details

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Namespace Prefix:
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Period Type:

X

- Details

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Namespace Prefix:
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- Details

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