Employee Benefit Plans - defined benefit plans (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Nov. 24, 2013		Nov. 25, 2012		Nov. 27, 2011
Net periodic benefit cost (income):
Curtailment (gain) loss	$ (564)		$ (2,391)		$ 129
Changes in accumulated other comprehensive loss:
Total recognized in accumulated other comprehensive loss	(104,189)		75,277		56,877
Pension plans, defined benefit [Member]
Net periodic benefit cost (income):
Service cost	8,707		8,952		10,241
Interest cost	51,984		57,635		60,314
Expected return on plan assets	(56,183)		(52,029)		(52,959)
Amortization of prior service (benefit) cost	(80)	[1]	(78)	[1]	47	[1]
Amortization of actuarial loss	16,311		12,612		14,908
Curtailment (gain) loss	(564)		(2,391)		129
Special termination benefit	(98)		(159)		(120)
Net settlement loss	517		383		714
Net periodic benefit cost (income)	20,790		25,243		33,514
Changes in accumulated other comprehensive loss:
Actuarial gain	134,378		(110,262)
Amortization of prior service benefit (cost)	80	[1]	78	[1]
Amortization of actuarial loss	(16,311)		(12,612)
Curtailment gain	498		192
Net settlement loss	(178)		(77)
Total recognized in accumulated other comprehensive loss	(150,289)		97,843
Total recognized in net periodic benefit cost (income) and accumulated other comprehensive loss	(129,499)		123,086
Other postretirement benefit plans, defined benefit [Member]
Net periodic benefit cost (income):
Service cost	376		397		478
Interest cost	4,957		6,634		7,629
Expected return on plan assets	0		0		0
Amortization of prior service (benefit) cost	(488)	[1]	(16,356)	[1]	(28,945)	[1]
Amortization of actuarial loss	6,765		5,157		5,025
Curtailment (gain) loss	0		0		0
Special termination benefit	0		0		0
Net settlement loss	0		0		0
Net periodic benefit cost (income)	11,610		(4,168)		(15,813)
Changes in accumulated other comprehensive loss:
Actuarial gain	10,626		(10,408)
Amortization of prior service benefit (cost)	488	[1]	16,356	[1]
Amortization of actuarial loss	(6,765)		(5,157)
Curtailment gain	0		0
Net settlement loss	0		0
Total recognized in accumulated other comprehensive loss	(16,903)		21,607
Total recognized in net periodic benefit cost (income) and accumulated other comprehensive loss	$ (5,293)		$ 17,439

[1] Postretirement benefits amortization of prior service benefit recognized during each of years 2012 and 2011 relates primarily to the favorable impact of the February 2004 and August 2003 plan amendments, which concluded amortization in 2012.