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v3.22.1

Significant Accounting Policies - Additional Information (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Sep. 30, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Restricted cash on deposit | $ 100,000 | $ 0
Cash and cash equivalents held by foreign subsidiaries | $ 1,800,000 |
Change in accounting principle, accounting standards update, adopted | true |
Change in accounting principle, accounting standards update, adoption date | Dec. 31, 2021 |
Change in accounting principle, accounting standards update, immaterial effect | true |
Accounting Standards Update [Extensible Enumeration] | us-gaap:AccountingStandardsUpdate201912Member |
Russian Federation Subsidiary |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cash and cash equivalents held by foreign subsidiaries | $ 1,000,000.0 |

X
- Definition Cash and cash equivalents held by foreign subsidiaries. + References No definition available. + Details
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Namespace Prefix: | geos_
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Balance Type: | debit
Period Type: | instant

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