Retirement And Other Benefit Plans (Schedule Of Components Of Net Periodic Benefit (Income) Cost) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 27, 2012	Oct. 29, 2011	Oct. 27, 2012	Oct. 29, 2011
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,845	$ 2,398	$ 8,675	$ 6,856
Interest cost	3,182	3,146	9,546	9,388
Expected return on assets	(6,266)	(5,188)	(18,806)	(15,552)
Amortization of Actuarial loss (gain)	41	97	166	304
Amortization of Prior service expense (income)	4	(3)	8	(6)
Amortization of Net transition asset	(11)	(12)	(33)	(35)
Total net periodic benefit (income) cost	(205)	438	(444)	955
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	36	44	112	132
Amortization of Actuarial loss (gain)	(23)	(25)	(59)	(75)
Total net periodic benefit (income) cost	$ 13	$ 19	$ 53	$ 57