XML 114 R31.htm IDEA: XBRL DOCUMENT
v3.19.3

Summary of Significant Accounting Policies (Tables) | 12 Months Ended
--- | ---
Sep. 30, 2019
Accounting Policies [Abstract] |
Property, Plant and Equipment Estimated Useful Life | Property, plant and equipment and rental equipment are stated at cost. Depreciation expense is calculated using the straight-line method over the following estimated useful lives:
|  | Years
Rental equipment |  | 2-5
Property, plant and equipment: |  |
Machinery and equipment |  | 3-15
Buildings and building improvements |  | 10-50
Other |  | 5-10
Schedule of Estimated Useful Lives of Other Intangible Assets | Amortization expense is calculated using the straight-line method over the following estimated useful lives:
|  | Years |
Developed technology |  |  | 18 |
Trade names |  |  | 5 |
Customer relationships |  |  | 4 |
Non-compete agreements |  |  | 4 |
Changes in Product Warranty Reserve | Changes in the product warranty reserve are reflected in the following table (in thousands):
Balance at October 1, 2017 |  | $ | 508 |
Accruals for warranties issued during the year |  |  | 1,074 |
Settlements made (in cash or in kind) during the year |  |  | (894 | )
Balance at September 30, 2018 |  |  | 688 |
Accruals for warranties issued during the year |  |  | 386 |
Settlements made (in cash or in kind) during the year |  |  | (845 | )
Balance at September 30, 2019 |  | $ | 229 |

X
- Definition Property, plant and equipment estimated useful life. + References No definition available. + Details
Name: | geos_PropertyPlantAndEquipmentEstimatedUsefulLifeTableTextBlock
Namespace Prefix: | geos_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
Name: | us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
Name: | us-gaap_ScheduleOfProductWarrantyLiabilityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration