Retirement and Other Benefit Plans (Shedule of Net Benefit Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 29, 2017	Apr. 30, 2016
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,467	$ 2,263
Interest cost	3,747	3,861
Expected return on assets	(6,880)	(7,223)
Amortization of:
Actuarial loss (gain)	1,152	38
Prior service income	(435)	(460)
Total net periodic benefit cost (income)	51	(1,521)
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	18	15
Expected return on assets	0	0
Amortization of:
Actuarial loss (gain)	(38)	(55)
Prior service income	0	0
Total net periodic benefit cost (income)	$ (20)	$ (40)