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Leases - Rental Equipment (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Sep. 30, 2019
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Leases [Abstract] |  |
Rental equipment, primarily wireless recording equipment | $ 114,990 | $ 107,645
Accumulated depreciation and impairment | (52,301) | (45,583)
Rental equipment, net | $ 62,689 | $ 62,062

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- Definition Rental equipment accumulated depreciation and impairment. + References No definition available. + Details
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Namespace Prefix: | geos_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Rental equipment gross. + References No definition available. + Details
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Namespace Prefix: | geos_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Rental equipment net. + References No definition available. + Details
Name: | geos_RentalEquipmentNet
Namespace Prefix: | geos_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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