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Retirement Plans (Funded Status) (Details) - Combined Employee Retirement Plans [Member] - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Change in Benefit Obligation    
Benefit obligation at beginning of year $ 43,292 $ 36,299
Service cost 0 0
Interest cost 1,211 1,382
Participant contributions 0 0
Amendments 0 0
Actuarial losses (gains) 1,588 8,280
Plan settlement 0 0
Benefits paid (1,913) (2,669)
Benefit obligation at end of year 44,178 43,292
Change in Plan Assets    
Fair value at beginning of year 23,654 23,527
Actual return on plan assets 1,591 1,806
Company contributions 640 990
Settlements 0 0
Benefits paid (1,913) (2,669)
Fair value at end of year 23,972 23,654
Unfunded status of the plans (20,206) (19,638)
Amounts Recognized in Statement of Financial Position    
Current liabilities (364) (314)
Non-current liabilities (19,842) (19,324)
Accrued benefit cost (20,206) (19,638)
Amounts Recognized in Statement of Financial Position and Operations    
Accrued benefit liability (20,206) (19,638)
Accumulated other compensation loss 14,444 15,427
Net amount recognized (5,762) (4,211)
Items not yet Recognized as a Component of Net Periodic Pension Expense, Included in AOCI    
Unrecognized net actuarial loss 14,444 15,427
Unamortized prior service costs 0 0
Net initial asset recognition 0 0
Net periodic pension expense, included in AOCI $ 14,444 $ 15,427