Retirement Plans (Pension Plans, Narrative) (Details) - USD ($)	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Liability for Future Policy Benefits, Life	$ 8,919,000	$ 9,102,000
Contribution amount, Qualified plan and VIP plan	954,000	1,080,000
Estimated contributions to qualified pension plans for 2021	600,000
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax	14,300,000
Estimated Impact Of One Percent Change in Investment Return	221,000
Estimated Impact Of One Percent Change in Discount Rate	$ 167,000
Combined Employee Retirement Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Percentage of trust assets managed	50.00%
Company contributions	$ 990,000	1,122,000
Accumulated other compensation loss	15,427,000	8,319,000
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax	$ 0	0
VIP Retirement Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit of average compensation	50.00%
Benefit of average compensation period	5 years
Cash surrender value	$ 3,384,000	$ 3,469,000
Debt Securities [Member] | Combined Employee Retirement Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Short-term investment funds	16.00%	16.00%
Fixed Income Securities [Member] | Combined Employee Retirement Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Percentage of assets held in trust (less than)	12.00%