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Sale of MSE (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Aug. 31, 2018
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Loss on sale of subsidiary   $ 5,405 $ 0 $ 0
Cumulative translation loss   $ 5,355 $ 0 $ 0
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 subsidiaries $ 1,200      
Interest rate on payments due from sale of subsidiary 9.00%      
Loss on sale of subsidiary $ 4,900      
Cumulative translation loss $ 5,400