Retirement And Other Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Nov. 01, 2014	Oct. 31, 2015	Nov. 01, 2014
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3,160	$ 2,413	$ 9,482	$ 7,239
Interest cost	3,580	3,558	10,744	10,674
Expected return on assets	(7,919)	(6,190)	(23,764)	(18,571)
Amortization of:
Actuarial loss (gain)	152	50	461	152
Prior service (income) expense	(478)	7	(1,434)	21
Total net periodic benefit income	(1,505)	(162)	(4,511)	(485)
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	14	12	42	36
Expected return on assets	0	0	0	0
Amortization of:
Actuarial loss (gain)	(56)	(108)	(167)	(325)
Prior service (income) expense	0	0	0	0
Total net periodic benefit income	$ (42)	$ (96)	$ (125)	$ (289)