Retirement Plans (Periodic Pension Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
Amortization of prior service cost (credit)	$ 776	$ 795
Total recognized in other Comprehensive Income	5,269	(217)
Items not yet Recognized as a Component of Net Periodic Pension Expense, Included in AOCI
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax	14,300
Combined Employee Retirement Plans [Member]
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
Net loss	7,885	1,039
Prior service cost	0	0
Amortization of loss	(776)	(1,333)
Amortization of prior service cost (credit)	0	0
Amortization of initial asset	0	0
Total recognized in other Comprehensive Income	7,109	(294)
Items not yet Recognized as a Component of Net Periodic Pension Expense, Included in AOCI
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax	0	0
Net actuarial loss	1,872	706
Net periodic pension cost	1,872	706
Projected benefit obligation	43,292	36,299	$ 40,181
Accumulated benefit obligation	43,292	36,299
Fair value of plan assets	23,654	23,527	$ 27,259
Components of Net Cost
Service cost	0	0
Interest cost	1,382	1,459
Expected return on plan assets	(1,432)	(1,535)
Amortization of transition amount	0	0
Recognized (gain) loss due to settlement	0	0
Amortization of prior service cost	0	0
Recognized net actuarial loss	776	1,333
Benefit cost	726	$ 1,257
Estimated Future Benefit Payments
FYE 01-31-2021	6,114
FYE 01-31-2022	2,992
FYE 01-31-2023	2,641
FYE 01-31-2024	2,549
FYE 01-31-2025	3,067
FYE 01-31-2026 to 2030	11,960
Total	$ 29,323
Weighted Average Assumptions to Determine Net Periodic Pension Cost
Discount rate	4.10%	4.25%
Expected return on plan assets	6.50%	6.50%
Minimum [Member] | Combined Employee Retirement Plans [Member]
Weighted Average Assumptions to Determine Benefit Obligations at Year-End
Discount rate	3.00%	3.75%
Maximum [Member] | Combined Employee Retirement Plans [Member]
Weighted Average Assumptions to Determine Benefit Obligations at Year-End
Discount rate	3.05%	4.00%