Pension and Other Postretirement Plans (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Aug. 31, 2013	Sep. 01, 2012	Aug. 31, 2013	Sep. 01, 2012
Defined Benefit Plan Disclosure [Line Items]
Cash contributions	$ 7,727		$ 24,270
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Cash contributions	7,709	5,369	24,216	20,297
Components of net periodic benefit cost (income):
Service cost	622	529	1,865	1,589
Interest cost	1,727	1,978	5,183	5,937
Expected return on plan assets	(2,694)	(2,103)	(8,086)	(6,311)
Settlement cost	3,111	0	3,111	0
Amortization of unrecognized:
Prior service cost	(3)	(2)	(8)	(8)
Net actuarial loss (gain)	1,516	1,909	4,547	5,727
Net periodic benefit cost (income)	4,279	2,311	6,612	6,934
Postretirement Healthcare Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Cash contributions	18	25	54	75
Components of net periodic benefit cost (income):
Interest cost	2	4	6	12
Amortization of unrecognized:
Prior service cost	(31)	(31)	(93)	(93)
Net actuarial loss (gain)	(37)	(30)	(111)	(90)
Net periodic benefit cost (income)	$ (66)	$ (57)	$ (198)	$ (171)