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Retirement Plans (Pension Plans, Narrative) (Details) - USD ($) | 12 Months Ended
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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% |

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- Definition Amount, after tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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