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Employee Postretirement Benefits Employee Postretirement Benefits (Tables)
3 Months Ended
Apr. 30, 2021
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,
2021
April 30,
2020
Service cost$$
Interest cost67 70 
Amortization of actuarial losses49 43 
Amortization of unrecognized gains in prior service cost(24)(40)
Net periodic benefit cost$101 $82