Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2022	Sep. 30, 2021
Significant Accounting Policies [Line Items]
Restricted cash on deposit	$ 200,000	$ 200,000	$ 0
Cash and cash equivalents held by foreign subsidiaries	2,600,000	$ 2,600,000	2,600,000
Minimum credit limit		30 days
Extended credit terms for trade receivables		60 days
Trade account and financing receivable due	3,000,000.0	$ 3,000,000.0
Impairment charge	$ 400,000	401,000
Income tax, Interest or penalties incurred		$ 0	$ 0
Change in accounting principle, accounting standards update, adopted	true	true
Change in accounting principle, accounting standards update, adoption date	Dec. 31, 2021	Dec. 31, 2021
Change in accounting principle, accounting standards update, immaterial effect	true	true
Accounting Standards Update [Extensible Enumeration]		us-gaap:AccountingStandardsUpdate201912Member
Emerging Markets
Significant Accounting Policies [Line Items]
Impairment charges related to long lived assets		$ 0
Product Concentration Risk | Sales Revenue, Net | Certain Models of Oil and Gas Marine Wireless Products
Significant Accounting Policies [Line Items]
Percentage of company revenue		11.00%	0.00%
Product Concentration Risk | Sales Revenue, Net | Thermal Film
Significant Accounting Policies [Line Items]
Percentage of company revenue		8.00%	7.00%
Customer one
Significant Accounting Policies [Line Items]
Trade account and financing receivable due	$ 5,500,000	$ 5,500,000	$ 4,900,000
Customer one | Customer Concentration Risk | Sales Revenue, Net
Significant Accounting Policies [Line Items]
Percentage of company revenue		29.30%	19.80%
Customer two
Significant Accounting Policies [Line Items]
Trade account and financing receivable due			$ 7,400,000
Customer two | Customer Concentration Risk | Sales Revenue, Net
Significant Accounting Policies [Line Items]
Percentage of company revenue			16.40%
Customer three
Significant Accounting Policies [Line Items]
Trade account and financing receivable due			$ 1,100,000
Customer three | Customer Concentration Risk | Sales Revenue, Net
Significant Accounting Policies [Line Items]
Percentage of company revenue			10.60%
Russian Federation Subsidiary
Significant Accounting Policies [Line Items]
Cash and cash equivalents held by foreign subsidiaries			$ 1,800,000
Geospace Technologies Eurasia LLC
Significant Accounting Policies [Line Items]
Percentage of ownership interest or majority of voting interests subject to sanctions		33.00%
Net carrying value of subsidiary	$ 6,000,000.0	$ 6,000,000.0
Revenue from domestic sales		1,900,000
Imported product for resale		$ 1,900,000