XML 77 R38.htm IDEA: XBRL DOCUMENT
v3.19.3

Inventories (Tables) | 12 Months Ended
--- | ---
Sep. 30, 2019
Inventory Disclosure [Abstract] |
Inventories | Inventories consisted of the following (in thousands):
|  | AS OF SEPTEMBER 30, |
|  | 2019 |  |  | 2018 |
Finished goods |  | $ | 17,967 |  |  | $ | 18,802 |
Work in process |  |  | 3,681 |  |  |  | 7,926 |
Raw materials |  |  | 55,781 |  |  |  | 54,290 |
Obsolescence reserve |  |  | (32,050 | ) |  |  | (30,551 | )
|  |  | 45,379 |  |  |  | 50,467 |
Less current portion |  |  | 23,855 |  |  |  | 18,812 |
Non-current portion |  | $ | 21,524 |  |  | $ | 31,655 |

X
- Definition Schedule of inventory current and noncurrent. + References No definition available. + Details
Name: | geos_ScheduleOfInventoryCurrentAndNoncurrentTableTextBlock
Namespace Prefix: | geos_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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