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Impairment of long-lived assets (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jul. 31, 2018 | Jan. 31, 2018
Tangible Asset Impairment Charges [Abstract] |  |
New Date of Annual Goodwill Impairment Test | impairment assessment of goodwill annually as of January 31 |
Impairment of long-lived assets | There was no impairment of long-lived assets for the three and six months ended July 31, 2018 and 2017 |
Goodwill recognized, description | allocated between intangible assets and the net tangible assets of the acquired business with the residual of the purchase price recorded as goodwill |
Goodwill | $ 2,287 | $ 2,423
Goodwill, Period Increase (Decrease) | $ (136) |
Goodwill no impairment | There was no impairment of goodwill for the three and six months ended July 31, 2018 and 2017. |

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- Definition This element represents a qualitative description of the factors that make up the goodwill recognized in a business combination, such as expected synergies by the entity to be derived from combining operations of the acquiree, intangible assets that do not qualify for separate recognition, and such other factors as may apply. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -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 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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- Definition Description of a change in the estimated amount of a goodwill impairment charge, including the facts and circumstances, including a change in assumptions, underlying the change in estimate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 35 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=77993916&loc=d3e12323-109265 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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- Definition Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + 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 + Details
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- Definition Voluntary or miscellaneous disclosures regarding impairment of long-lived assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section S99 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27011434&loc=d3e125687-122742 + Details
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- Definition The new date of the annual goodwill impairment test. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.10-01.(b)(6)) -URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699 + Details
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