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Retirement Plans (Funded Status) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2016
Change in Plan Assets      
Company contributions $ 1,400 $ 1,400 $ 1,600
Employee Plan [Member]      
Change in Benefit Obligation      
Benefit obligation at beg. of year 31,212 32,659  
Service cost 0 0  
Interest cost 1,217 1,184  
Participant contributions 0 0  
Amendments 0 0  
Actuarial losses (gains) 256 (1,125)  
Plan settlement 0 0  
Benefits paid (1,758) (1,506)  
Benefit obligation at end of year 30,927 31,212 32,659
Change in Plan Assets      
Fair value at beg. of year 22,911 19,848  
Actual return on plan assets 4,726 3,169  
Company contributions 1,380 1,400  
Settlements 0 0  
Benefits paid (1,758) (1,506)  
Fair value at end of year 27,259 22,911 19,848
Unfunded status of the plan (3,668) (8,301)  
Amounts Recognized in Statement of Financial Position      
Current liabilities 0 0  
Non-current liabilities (3,668) (8,301)  
Accrued benefit cost (3,668) (8,301)  
Amounts Recognized in Statement of Financial Position and Operations      
Accrued benefit liability (3,668) (8,301)  
Accumulated other comp. loss (gain) 5,749 9,567  
Net amount recognized 2,081 1,266  
Items not yet Recognized as a Component of Net Periodic Pension Expense, Included in AOCI      
Unrecognized net actuarial loss (gain) 5,749 9,567  
Unamortized prior service costs 0 0  
Net initial asset recognition 0 0  
Net periodic pension expense, included in AOCI 5,749 9,567  
VIP Retirement Plan [Member]      
Change in Benefit Obligation      
Benefit obligation at beg. of year 8,292 8,701  
Service cost 0 0  
Interest cost 367 357  
Participant contributions 0 0  
Amendments 0 0  
Actuarial losses (gains) 656 (266)  
Plan settlement 0 0  
Benefits paid (309) (500)  
Benefit obligation at end of year 9,006 8,292 8,701
Change in Plan Assets      
Fair value at beg. of year 0 0  
Actual return on plan assets 0 0  
Company contributions 309 500  
Settlements 0 0  
Benefits paid (309) (500)  
Fair value at end of year 0 0 0
Unfunded status of the plan (9,006) (8,292)  
Amounts Recognized in Statement of Financial Position      
Current liabilities (312) (278)  
Non-current liabilities (8,694) (8,014)  
Accrued benefit cost (9,006) (8,292)  
Amounts Recognized in Statement of Financial Position and Operations      
Accrued benefit liability (9,006) (8,292)  
Accumulated other comp. loss (gain) 2,863 2,447  
Net amount recognized (6,143) (5,845)  
Items not yet Recognized as a Component of Net Periodic Pension Expense, Included in AOCI      
Unrecognized net actuarial loss (gain) 2,863 2,447  
Unamortized prior service costs 0 0  
Net initial asset recognition 0 0  
Net periodic pension expense, included in AOCI 2,863 2,447  
Directors Plan [Member]      
Change in Benefit Obligation      
Benefit obligation at beg. of year 257 280  
Service cost 0 0  
Interest cost 9 10  
Participant contributions 0 0  
Amendments 0 0  
Actuarial losses (gains) 18 3  
Plan settlement 0 0  
Benefits paid (36) (36)  
Benefit obligation at end of year 248 257 280
Change in Plan Assets      
Fair value at beg. of year 0 0  
Actual return on plan assets 0 0  
Company contributions 36 36  
Settlements 0 0  
Benefits paid (36) (36)  
Fair value at end of year 0 0 $ 0
Unfunded status of the plan (248) (257)  
Amounts Recognized in Statement of Financial Position      
Current liabilities (34) (34)  
Non-current liabilities (214) (223)  
Accrued benefit cost (248) (257)  
Amounts Recognized in Statement of Financial Position and Operations      
Accrued benefit liability (248) (257)  
Accumulated other comp. loss (gain) 0 0  
Net amount recognized (248) (257)  
Items not yet Recognized as a Component of Net Periodic Pension Expense, Included in AOCI      
Unrecognized net actuarial loss (gain) 0 0  
Unamortized prior service costs 0 0  
Net initial asset recognition 0 0  
Net periodic pension expense, included in AOCI $ 0 $ 0