Retirement and Other Benefit Plans (Shedule of Net Benefit Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 28, 2017	Oct. 29, 2016	Oct. 28, 2017	Oct. 29, 2016
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,426	$ 2,084	$ 7,276	$ 6,251
Interest cost	3,736	3,835	11,210	11,506
Expected return on assets	(6,896)	(7,237)	(20,689)	(21,712)
Amortization of:
Actuarial loss (gain)	1,090	38	3,238	115
Prior service income	(439)	(461)	(1,335)	(1,382)
Settlement cost				250
Curtailment cost	36		36
Total net periodic benefit income	(47)	(1,741)	(264)	(4,972)
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	17	15	51	45
Amortization of:
Actuarial loss (gain)	(36)	(55)	(109)	(165)
Total net periodic benefit income	$ (19)	$ (40)	$ (58)	$ (120)