XML 12 R1.htm IDEA: XBRL DOCUMENT v3.3.1.900
Document and Entity Information - shares
3 Months Ended
Dec. 31, 2015
Jan. 31, 2016
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Dec. 31, 2015  
Document Fiscal Year Focus 2016  
Document Fiscal Period Focus Q1  
Trading Symbol GEOS  
Entity Registrant Name GEOSPACE TECHNOLOGIES CORP  
Entity Central Index Key 0001001115  
Current Fiscal Year End Date --09-30  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   13,328,066