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Retirement plans Amounts recognized in other comprehensive income (Tables) | 12 Months Ended
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Jan. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] |
Amounts recognized in other comprehensive income |  |
Actuarial loss on obligation | $493 | $1,115
Actual loss (gain) on plan assets | 338 |  | (294 | )
Total in other comprehensive income | $831 | $821
Other comprehensive income is also affected by the tax effect of the valuation allowance recorded on the domestic deferred tax assets.

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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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- Definition Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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