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Retirement and Other Benefit Plans (Shedule of Net Benefit Income) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 29, 2017
Jul. 30, 2016
Jul. 29, 2017
Jul. 30, 2016
Pension Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 2,383 $ 1,904 $ 4,850 $ 4,167
Interest cost 3,727 3,810 7,474 7,671
Expected return on assets (6,913) (7,252) (13,793) (14,475)
Amortization of:        
Actuarial loss (gain) 996 39 2,148 77
Prior service income (461) (461) (896) (921)
Settlement cost 0 250 0 250
Total net periodic benefit income (268) (1,710) (217) (3,231)
Other Postretirement Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 0 0 0
Interest cost 16 15 34 30
Expected return on assets 0 0 0 0
Amortization of:        
Actuarial loss (gain) (35) (55) (73) (110)
Prior service income 0 0 0 0
Settlement cost 0 0    
Total net periodic benefit income $ (19) $ (40) $ (39) $ (80)