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Retirement plans Components of net periodic benefit cost (Tables) | 12 Months Ended
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Jan. 31, 2018
Retirement Benefits [Abstract] |
Schedule of Net Benefit Costs [Table Text Block] |
Components of net periodic benefit cost (in thousands) | 2017 | 2016
Interest cost | $253 | $278
Expected return on plan assets | (484) | (458)
Recognized actuarial loss | 82 | 146
Net periodic benefit income | ($149) | ($34)

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + 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 (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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