Employee Benefit Plans - amounts recognized in balance sheet (Details) (USD $) In Thousands, unless otherwise specified	Nov. 24, 2013	Nov. 25, 2012
Pension plans, defined benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Prepaid benefit cost	$ 1,331	$ 0
Accrued benefit liability – current portion	(8,622)	(8,217)
Accrued benefit liability – long-term portion	(323,475)	(486,071)
Amount recognized in balance sheet	(330,766)	(494,288)
Accumulated other comprehensive loss:
Net actuarial loss	(343,148)	(493,487)
Net prior service benefit	666	708
Other comprehensive income (loss)	(342,482)	(492,779)
Other postretirement benefit plans, defined benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Prepaid benefit cost	0	0
Accrued benefit liability – current portion	(13,347)	(14,906)
Accrued benefit liability – long-term portion	(122,248)	(140,958)
Amount recognized in balance sheet	(135,595)	(155,864)
Accumulated other comprehensive loss:
Net actuarial loss	(34,248)	(51,644)
Net prior service benefit	0	493
Other comprehensive income (loss)	$ (34,248)	$ (51,151)