Retirement Plans (Periodic Pension Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
Amortization of prior service cost (credit)	$ 1,328	$ 2,013	$ 1,283
Total recognized in other Comprehensive Income	(2,936)	(5,904)	6,254
Items not yet Recognized as a Component of Net Periodic Pension Expense, Included in AOCI
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Prior Service Cost (Credit), after Tax	11,400
Employee Plan [Member]
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
Net loss (gain)	(3,159)	(1,986)
Prior service cost		0
Amortization of (loss) gain	(1,162)	(2,117)
Amortization of prior service cost (credit)	0	0
Amortization of initial asset	0	0
Total recognized in other Comprehensive Income	(4,321)	(4,103)
Items not yet Recognized as a Component of Net Periodic Pension Expense, Included in AOCI
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Prior Service Cost (Credit), after Tax	0	0
Net actuarial loss (gain)	715	1,162
Net periodic pension cost	715	1,162
Projected benefit obligation	31,212	32,659	37,708
Accumulated benefit obligation	31,212	32,659
Fair value of plan assets	22,911	19,848	21,187
Components of Net Cost
Service cost	0	0
Interest cost	1,184	1,147
Expected return on plan assets	(1,134)	(1,295)
Amortization of transition amount	0	0
Recognized (gain) loss due to settlement	0	587
Amortization of prior service cost	0	0
Recognized net actuarial loss	1,162	1,529
Benefit cost	1,212	$ 1,968
Estimated Future Benefit Payments
FYE 01-31-2018	6,076
FYE 01-31-2019	1,726
FYE 01-31-2020	1,594
FYE 01-31-2021	1,605
FYE 01-31-2022 to 2026	1,619
FYE 01-31-2023 to 2027	9,570
Total	$ 22,190
Weighted Average Assumptions to Determine Benefit Obligations at Year-End
Discount rate	4.25%	4.00%
Weighted Average Assumptions to Determine Net Periodic Pension Cost
Discount rate	4.00%	3.25%
Expected return on plan assets	6.50%	6.50%
VIP Retirement Plan [Member]
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
Net loss (gain)	$ (266)	$ (1,209)
Prior service cost
Amortization of (loss) gain	(310)	(484)
Amortization of prior service cost (credit)	0	0
Amortization of initial asset	0	0
Total recognized in other Comprehensive Income	(576)	(1,693)
Items not yet Recognized as a Component of Net Periodic Pension Expense, Included in AOCI
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Prior Service Cost (Credit), after Tax	0	0
Net actuarial loss (gain)	240	310
Net periodic pension cost	240	310
Projected benefit obligation	8,292	8,701	10,104
Accumulated benefit obligation	8,292	8,701
Fair value of plan assets	0	0	0
Components of Net Cost
Service cost	0	0
Interest cost	357	343
Expected return on plan assets	0	0
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	310	484
Benefit cost	667	$ 827
Estimated Future Benefit Payments
FYE 01-31-2018	284
FYE 01-31-2019	312
FYE 01-31-2020	333
FYE 01-31-2021	322
FYE 01-31-2022 to 2026	354
FYE 01-31-2023 to 2027	2,048
Total	$ 3,653
Weighted Average Assumptions to Determine Benefit Obligations at Year-End
Discount rate	4.50%	4.25%
Weighted Average Assumptions to Determine Net Periodic Pension Cost
Discount rate	4.25%	3.50%
Directors Plan [Member]
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
Net loss (gain)	$ 3	$ (107)
Prior service cost	0	0
Amortization of (loss) gain	144	0
Amortization of prior service cost (credit)	0	0
Amortization of initial asset	0	0
Total recognized in other Comprehensive Income	147	(107)
Items not yet Recognized as a Component of Net Periodic Pension Expense, Included in AOCI
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Prior Service Cost (Credit), after Tax	0	0
Net actuarial loss (gain)	0	(116)
Net periodic pension cost	0	(116)
Projected benefit obligation	257	280	428
Accumulated benefit obligation	257	280
Fair value of plan assets	0	0	$ 0
Components of Net Cost
Service cost	0	0
Interest cost	10	13
Expected return on plan assets	0	0
Amortization of transition amount	0	0
Recognized (gain) loss due to settlement	0	0
Recognized net actuarial loss	(144)	0
Benefit cost	(134)	$ 13
Estimated Future Benefit Payments
FYE 01-31-2018	34
FYE 01-31-2019	32
FYE 01-31-2020	31
FYE 01-31-2021	29
FYE 01-31-2022 to 2026	27
FYE 01-31-2023 to 2027	70
Total	$ 223
Weighted Average Assumptions to Determine Benefit Obligations at Year-End
Discount rate	4.25%	3.25%
Weighted Average Assumptions to Determine Net Periodic Pension Cost
Discount rate	4.00%	3.25%