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Retirement plans Assumptions (Tables) | 12 Months Ended
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Jan. 31, 2018
Retirement Benefits [Abstract] |
Schedule of Assumptions Used [Table Text Block] |
Weighted-average assumptions used to determine net cost and benefit obligations | 2017 |  | 2016 |
End of year benefit obligation discount rate | 3.70 | % | 4.00 | %
Service cost discount rate | 4.00 | % | 4.05 | %
Expected return on plan assets | 8.00 | % | 8.00 | %

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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + 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 (k) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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