Document and Entity Information (USD $) In Billions, except Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Nov. 18, 2013	Mar. 31, 2013
Document Information [Line Items]
Entity Registrant Name	GEOSPACE TECHNOLOGIES CORP
Entity Central Index Key	0001001115
Document Type	10-K
Document Period End Date	Sep. 30, 2013
Amendment Flag	false
Document Fiscal Year Focus	2013
Trading Symbol	GEOS
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--09-30
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 1.4
Entity Common Stock, Shares Outstanding		12,948,916