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Employee Postretirement Benefits Employee Postretirement Benefits (Tables)
 6 Months Ended
Jul. 31, 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 EndedSix Months Ended
July 31,
2020		July 31,
2019		July 31,
2020		July 31,
2019
Service cost$9 $7 $18 $14 
Interest cost70 84 140 167 
Amortization of actuarial losses43 24 86 48 
Amortization of unrecognized gains in prior service cost(40)(40)(80)(80)
Net periodic benefit cost$82 $75 $164 $149