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Retirement Plans (Pension Plans, Narrative) (Details) - USD ($)
 12 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Liability for Future Policy Benefits, Life   $ 9,189,000 $ 9,391,000  
Restructuring expense   0 0 $ 287,000
Company contributions   1,400,000 1,600,000 2,400,000
Benefit payments   536,000 591,000 $ 580,000
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Prior Service Cost (Credit), after Tax   $ 11,400,000    
Employee Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Percentage of trust assets managed   70.00%    
Company contributions   $ 1,400,000 1,575,000  
Accumulated other comprehensive loss net of tax   9,567,000 13,889,000  
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax   3,159,000 1,986,000  
Defined Benefit Plan, Accumulated Other Comprehensive Income Net 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   $ 3,367,000 3,462,000  
Company contributions   500,000 537,000  
Accumulated other comprehensive loss net of tax   2,447,000 3,023,000  
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax   266,000 1,209,000  
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Prior Service Cost (Credit), after Tax   0 0  
Directors Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Company contributions   36,000 54,000  
Accumulated other comprehensive loss net of tax   0 (144,000)  
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax   (3,000) 107,000  
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Prior Service Cost (Credit), after Tax   $ 0 $ 0  
Debt Securities [Member] | Employee Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Short-term investment funds   9.00% 23.00%  
Scenario, Forecast [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Estimated contributions to qualified pension plans for 2018 $ 1,400,000      
Estimated future contributions to non-qualified plans for 2018 $ 318,000      
Fixed Income Securities [Member] | Employee Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Percentage of assets held in trust (less than)   10.00%