XML 86 R71.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Significant accounting policies Reclassification (Details) | 12 Months Ended
--- | ---
Jan. 31, 2018 USD ($)
Reclassification from short-term to long-term | $ 2,000,000

X
- Definition The amount of a reclassification adjustment made to prior period financial statement amounts. + References No definition available. + Details
Name: | us-gaap_PriorPeriodReclassificationAdjustment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration