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Other accrued liabilities (Details) $ in Millions | 9 Months Ended
--- | ---
Oct. 31, 2016 USD ($)
Accrued Liabilities [Abstract] |
Litigation Settlement, Amount | $ 0.8

X
- References No definition available. + Details
Name: | us-gaap_AccruedLiabilitiesCurrentAndNoncurrentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration