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Employee Postretirement Benefits Employee Postretirement Benefits (Tables)
 6 Months Ended
Jul. 31, 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 EndedSix Months Ended
July 31,
2021		July 31,
2020		July 31,
2021		July 31,
2020
Service cost$8 $9 $17 $18 
Interest cost67 70 134 140 
Amortization of actuarial losses49 43 98 86 
Amortization of unrecognized gains in prior service cost(23)(40)(47)(80)
Net periodic benefit cost$101 $82 $202 $164