XML 63 R52.htm IDEA: XBRL DOCUMENT
v3.21.2

Leases - Rental Equipment (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Rental Equipment [Abstract] |  |
Rental equipment, primarily wireless recording equipment | $ 95,665 | $ 114,783
Accumulated depreciation and impairment | (53,803) | (60,466)
Rental equipment, net | $ 41,862 | $ 54,317

X
- Definition Rental equipment. + References No definition available. + Details
Name: | geos_RentalEquipmentAbstract
Namespace Prefix: | geos_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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

X
- 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