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Impairment of long lived assets (Details) | 6 Months Ended
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Jul. 31, 2016
Property, Plant and Equipment [Line Items] |
Impairment of Tangible Assets, Other Descriptors | There was no impairment of long-lived assets as of July 31, 2016 and January 31, 2016

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration