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Employee Postretirement Benefits Employee Postretirement Benefits (Tables)
3 Months Ended
Apr. 30, 2020
Retirement Benefits [Abstract]  
Components of net periodic benefit cost for postretirement plan The components of the net periodic benefit cost for postretirement benefits are as follows:
Three Months Ended
April 30,
2020
April 30,
2019
Service cost$ $ 
Interest cost70  83  
Amortization of actuarial losses43  24  
Amortization of unrecognized gains in prior service cost(40) (40) 
Net periodic benefit cost$82  $74