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Impairment of long-lived assets (Tables) | 6 Months Ended
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Jul. 31, 2018
Tangible Asset Impairment Charges [Abstract] |
Schedule of Goodwill |
| January 31, 2018 | Foreign exchange change effect | July 31, 2018
Goodwill |  | $2,423 |  |  | ($136 | ) |  | $2,287 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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