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Subsequent events (Details) | 12 Months Ended
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Jan. 31, 2014
Subsequent Event [Line Items] |
Disposal date | Jun. 26, 2013
Subsequent event, date | Apr. 10, 2014
Denmark |
Subsequent Event [Line Items] |
Disposal date | Feb. 28, 2014

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- Definition Date the entity disposed of a business or a group of assets, in CCYY-MM-DD format. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- Definition Date the event occurred after the balance sheet date but before financial statements are issues or available to be issued, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 855 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662 + Details
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