Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	May 26, 2013	May 27, 2012	May 26, 2013	May 27, 2012
Net periodic benefit cost (income):
Curtailment (gain) loss			$ (510)	$ (995)
Changes in accumulated other comprehensive loss:
Total recognized in accumulated other comprehensive loss	(3,199)	(321)	(7,108)	(617)
Pension Benefits [Member]
Net periodic benefit cost (income):
Service cost	2,215	2,247	4,496	4,494
Interest cost	12,994	14,435	26,060	28,848
Expected return on plan assets	(13,946)	(13,108)	(27,960)	(26,117)
Amortization of prior service (benefit) cost	(17)	(21)	(37)	(41)
Amortization of actuarial loss	4,213	3,161	8,431	6,303
Curtailment (gain) loss	(510)	(222)	(510)	(995)
Net settlement loss	584	310	629	417
Net periodic benefit cost (income)	5,533	6,802	11,109	12,909
Changes in accumulated other comprehensive loss:
Actuarial (gain) loss	0	74	0	70
Amortization of prior service benefit (cost)	17	21	37	41
Amortization of actuarial loss	(4,213)	(3,161)	(8,431)	(6,303)
Curtailment gain (loss)	949	0	509	(1)
Net settlement gain (loss)	(184)	(145)	(184)	(196)
Total recognized in accumulated other comprehensive loss	(3,431)	(3,211)	(8,069)	(6,389)
Total recognized in net periodic benefit cost (income) and accumulated other comprehensive loss	2,102	3,591	3,040	6,520
Postretirement Benefits [Member]
Net periodic benefit cost (income):
Service cost	94	100	188	199
Interest cost	1,240	1,658	2,479	3,317
Expected return on plan assets	0	0	0	0
Amortization of prior service (benefit) cost	(122)	(4,089)	(244)	(8,178)
Amortization of actuarial loss	1,692	1,289	3,383	2,578
Curtailment (gain) loss	0	0	0	0
Net settlement loss	0	0	0	0
Net periodic benefit cost (income)	2,904	(1,042)	5,806	(2,084)
Changes in accumulated other comprehensive loss:
Actuarial (gain) loss	0	0	0	0
Amortization of prior service benefit (cost)	122	4,089	244	8,178
Amortization of actuarial loss	(1,692)	(1,289)	(3,383)	(2,578)
Curtailment gain (loss)	0	0	0	0
Net settlement gain (loss)	0	0	0	0
Total recognized in accumulated other comprehensive loss	(1,570)	2,800	(3,139)	5,600
Total recognized in net periodic benefit cost (income) and accumulated other comprehensive loss	$ 1,334	$ 1,758	$ 2,667	$ 3,516