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Supplemental Cash Flow Information - Supplemental Cash Flow Information Components (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021
Supplemental Cash Flow Elements [Abstract] |  |
Cash paid for income taxes | $ 169 | $ 551
Non-cash investing and financing activities: |  |
Inventory transferred to rental equipment | 1,148 | 4,038
Inventory transferred to property, plant and equipment | 172 | 286
Issuance of notes receivables in connection with sale of used rental equipment | $ 11,745 | $ 2,665

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- Definition Assets that have been manufactured by company that is transferred to fixed assets to generate rental revenue. + References No definition available. + Details
Name: | geos_InventoriesTransferredToRentalEquipment
Namespace Prefix: | geos_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Inventory transferred to property, plant and equipment. + References No definition available. + Details
Name: | geos_InventoryTransferredToPropertyPlantAndEquipment
Namespace Prefix: | geos_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Issuance of notes receivables in connection with sale of used rental equipment. + References No definition available. + Details
Name: | geos_IssuanceOfNotesReceivablesInConnectionWithSaleOfUsedRentalEquipment
Namespace Prefix: | geos_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126999549&loc=d3e4297-108586 + Details
Name: | us-gaap_IncomeTaxesPaidNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_SupplementalCashFlowElementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration