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Employee Benefits	12 Months Ended
Employee Benefits	Sep. 30, 2018
Compensation And Retirement Disclosure [Abstract]
Employee Benefits	14. Employee Benefits The Company’s U.S. employees are participants in the Geospace Technologies Corporation’s Employee’s 401(k) Retirement Plan (the “Plan”), which covers substantially all eligible employees in the United States. The Plan is a qualified salary reduction plan in which all eligible participants may elect to have a percentage of their compensation contributed to the Plan, subject to certain guidelines issued by the Internal Revenue Service. The Company’s share of discretionary matching contributions was approximately $0.8 million in fiscal years 2018, 2017 and 2016. The Company’s stock incentive plans in which key employees may participate are discussed in Note 15 to these consolidated financial statements.