Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Feb. 23, 2014	Feb. 24, 2013
Changes in accumulated other comprehensive loss:
Total recognized in accumulated other comprehensive loss	$ (2,302)	$ (3,909)
Pension Benefits [Member]
Net periodic benefit cost (income):
Service cost	2,159	2,281
Interest cost	13,761	13,066
Expected return on plan assets	(13,843)	(14,014)
Amortization of prior service benefit	(17)	(20)
Amortization of actuarial loss	2,696	4,218
Curtailment gain	232	0
Net settlement loss	60	45
Net periodic benefit cost (income)	5,048	5,576
Changes in accumulated other comprehensive loss:
Amortization of prior service benefit	17	20
Amortization of actuarial loss	(2,696)	(4,218)
Curtailment (loss) gain	0	(440)
Net settlement (loss) gain	(25)	0
Total recognized in accumulated other comprehensive loss	(2,704)	(4,638)
Total recognized in net periodic benefit cost (income) and accumulated other comprehensive loss	2,344	938
Postretirement Benefits [Member]
Net periodic benefit cost (income):
Service cost	68	94
Interest cost	1,338	1,239
Expected return on plan assets	0	0
Amortization of prior service benefit	(1)	(122)
Amortization of actuarial loss	989	1,691
Curtailment gain	700	0
Net settlement loss	0	0
Net periodic benefit cost (income)	3,094	2,902
Changes in accumulated other comprehensive loss:
Amortization of prior service benefit	1	122
Amortization of actuarial loss	(989)	(1,691)
Curtailment (loss) gain	0	0
Net settlement (loss) gain	0	0
Total recognized in accumulated other comprehensive loss	(988)	(1,569)
Total recognized in net periodic benefit cost (income) and accumulated other comprehensive loss	$ 2,106	$ 1,333