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Sale of Subsidiaries (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 15 Months Ended
Feb. 28, 2019
USD ($)
Aug. 31, 2018
USD ($)
payment
Oct. 31, 2019
USD ($)
Oct. 31, 2018
USD ($)
Oct. 31, 2019
USD ($)
Oct. 31, 2018
USD ($)
Oct. 31, 2019
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Loss on sale subsidiary     $ 0 $ 4,905 $ 0 $ 4,905  
Cumulative translation loss     $ 0 $ 5,355 $ 0 $ 5,355  
Seismic Asia Pacific Pty Ltd | Disposal Group, Disposed of by Sale, Not Discontinued Operations              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Proceeds from sale of subsidiary $ 660            
Proceeds in cash from sale of subsidiary $ 240            
Note receivable term (in years) 2 years            
Proceeds in note receivable from sale of subsidiary $ 420            
Working capital adjustment $ 114            
Mitcham Seismic Eurasia LLC | Disposal Group, Disposed of by Sale, Not Discontinued Operations              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Proceeds from sale of subsidiary   $ 1,200          
Proceeds in cash from sale of subsidiary             $ 555
Number of payments | payment   8          
Interest rate on payments due from sale of subsidiary   9.00%          
Loss on sale subsidiary   $ 4,900          
Cumulative translation loss   $ 5,400