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Retirement plans Components of net periodic benefit cost (Tables)
12 Months Ended
Jan. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
Components of net periodic benefit cost
2016
2015
Interest cost
$278
$266
Expected return on plan assets
(458)
(479)
Recognized actuarial loss
146
210
  Net periodic benefit income
($34)
($3)