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Employee Postretirement Benefits Employee Postretirement Benefits (Tables)
 3 Months Ended
Apr. 30, 2018
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,
2018
 
April 30,
2017
Service cost
$
7

 
$
22

Interest cost
79

 
82

Amortization of actuarial losses
32

 
30

Amortization of unrecognized gains in prior service cost
(40
)
 
(40
)
Net periodic benefit cost
$
78

 
$
94