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Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

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Amount of accrued obligation to policyholders that relates to insured events under long-term life insurance contracts.

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Retirement Plans (Pension Plans, Narrative) (Details) - USD ($)	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Liability for Future Policy Benefits, Life		$ 9,102,000	$ 9,095,000
Company contributions		800,000	1,400,000
Estimated contributions to qualified pension plans for 2020		4,500,000
Benefit payments		281,000	345,000
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax		$ 9,000,000
Combined Employee Retirement Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Percentage of trust assets managed		55.00%
Company contributions		$ 1,122,000	1,725,000
Accumulated other comp. loss (gain)		8,319,000	8,612,000
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		$ 3,469,000	$ 3,411,000
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%	15.00%
Scenario, Forecast [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Estimated future contributions to non-qualified plans for 2020	$ 281,000
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)		14.00%