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Retirement plans Assumptions (Tables)
 12 Months Ended
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
%