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Valuation and Qualifying Accounts (Parenthetical) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jan. 31, 2017 | Jan. 31, 2016 | Jan. 31, 2015
Valuation And Qualifying Accounts [Abstract] |  |  |
Prior year adjustments | $ 89 | $ 177 |
Reversal due to legal entity elimination | (280) |  |
Expired tax losses |  | (745) |
Adjustments | $ (191) | $ (568) | $ 29

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- Definition Valuation allowances and reserves adjustments expired tax losses. + References No definition available. + Details
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- Definition Valuation allowances and reserves adjustments prior year adjustments. + References No definition available. + Details
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- Definition Valuation allowances and reserves adjustments reversal due to legal entity elimination. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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