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Retirement Plans (Periodic Pension Cost) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2016
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income      
Amortization of prior service cost (credit) $ 955 $ 1,328 $ 2,013
Total recognized in other Comprehensive Income (2,135) (2,936) (5,904)
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 9,300    
Employee Plan [Member]      
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income      
Net loss (gain) (3,103) (3,159)  
Prior service cost 0 0  
Amortization of (loss) gain (715) (1,162)  
Amortization of prior service cost (credit) 0 0  
Amortization of initial asset 0 0  
Total recognized in other Comprehensive Income (3,818) (4,321)  
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) 362 715  
Net periodic pension cost 362 715  
Projected benefit obligation 30,927 31,212 32,659
Accumulated benefit obligation 30,927 31,212  
Fair value of plan assets 27,259 22,911 19,848
Components of Net Cost      
Service cost 0 0  
Interest cost 1,217 1,184  
Expected return on plan assets (1,367) (1,134)  
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 715 1,162  
Benefit cost 565 $ 1,212  
Estimated Future Benefit Payments      
FYE 01-31-2019 5,215    
FYE 01-31-2020 2,415    
FYE 01-31-2021 2,077    
FYE 01-31-2022 1,897    
FYE 01-31-2023 1,895    
FYE 01-31-2024 to 2028 9,325    
Total $ 22,824    
Weighted Average Assumptions to Determine Benefit Obligations at Year-End      
Discount rate 3.75% 4.25%  
Weighted Average Assumptions to Determine Net Periodic Pension Cost      
Discount rate 4.25% 4.00%  
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) $ 656 $ (266)  
Prior service cost 0  
Amortization of (loss) gain (240) (310)  
Amortization of prior service cost (credit) 0 0  
Amortization of initial asset 0 0  
Total recognized in other Comprehensive Income 416 (576)  
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) 330 240  
Net periodic pension cost 330 240  
Projected benefit obligation 9,006 8,292 8,701
Accumulated benefit obligation 9,006 8,292  
Fair value of plan assets 0 0 0
Components of Net Cost      
Service cost 0 0  
Interest cost 367 357  
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 240 310  
Benefit cost 607 $ 667  
Estimated Future Benefit Payments      
FYE 01-31-2019 312    
FYE 01-31-2020 324    
FYE 01-31-2021 316    
FYE 01-31-2022 352    
FYE 01-31-2023 366    
FYE 01-31-2024 to 2028 2,191    
Total $ 3,861    
Weighted Average Assumptions to Determine Benefit Obligations at Year-End      
Discount rate 4.00% 4.50%  
Weighted Average Assumptions to Determine Net Periodic Pension Cost      
Discount rate 4.25% 4.25%  
Directors Plan [Member]      
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income      
Net loss (gain) $ 0 $ 3  
Prior service cost 0 0  
Amortization of (loss) gain 144  
Amortization of prior service cost (credit) 0 0  
Amortization of initial asset 0 0  
Total recognized in other Comprehensive Income 0 147  
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 0  
Net periodic pension cost 0 0  
Projected benefit obligation 248 257 280
Accumulated benefit obligation 248 257  
Fair value of plan assets 0 0 $ 0
Components of Net Cost      
Service cost 0 0  
Interest cost 9 10  
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 0 (144)  
Benefit cost 9 $ (134)  
Estimated Future Benefit Payments      
FYE 01-31-2019 34    
FYE 01-31-2020 32    
FYE 01-31-2021 31    
FYE 01-31-2022 29    
FYE 01-31-2023 27    
FYE 01-31-2024 to 2028 70    
Total $ 223    
Weighted Average Assumptions to Determine Benefit Obligations at Year-End      
Discount rate 3.75% 4.25%  
Weighted Average Assumptions to Determine Net Periodic Pension Cost      
Discount rate 4.25% 4.00%