Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 29, 2016	May 31, 2015	May 29, 2016		May 31, 2015
Pension Benefits [Member]
Net periodic benefit cost (income):
Service cost	$ 2,072	$ 2,090	$ 4,130		$ 4,218
Interest cost(1)	9,490	11,790	18,962	[1]	23,630	[1]
Expected return on plan assets	(12,162)	(12,716)	(24,296)		(25,433)
Amortization of prior service benefit	(16)	(15)	(31)		(31)
Amortization of actuarial loss	3,028	3,163	6,035		6,323
Curtailment loss	0	52	0		387
Net periodic benefit cost	2,412	4,364	4,800		9,094
Changes in accumulated other comprehensive loss:
Actuarial gain (loss)	18	0	170		0
Amortization of prior service benefit	16	15	31		31
Amortization of actuarial loss	(3,028)	(3,163)	(6,035)		(6,323)
Curtailment loss	0	(52)	0		(387)
Total recognized in accumulated other comprehensive loss	(2,994)	(3,200)	(5,834)		(6,679)
Total recognized in net periodic benefit cost and accumulated other comprehensive loss	(582)	1,164	(1,034)		2,415
Postretirement Benefits [Member]
Net periodic benefit cost (income):
Service cost	50	62	100		125
Interest cost(1)	806	1,147	1,612	[1]	2,294	[1]
Expected return on plan assets	0	0	0		0
Amortization of prior service benefit	0	0	0		0
Amortization of actuarial loss	741	1,128	1,483		2,256
Curtailment loss	0	0	0		0
Net periodic benefit cost	1,597	2,337	3,195		4,675
Changes in accumulated other comprehensive loss:
Actuarial gain (loss)	0	0	0		0
Amortization of prior service benefit	0	0	0		0
Amortization of actuarial loss	(741)	(1,128)	(1,483)		(2,256)
Curtailment loss	0	0	0		0
Total recognized in accumulated other comprehensive loss	(741)	(1,128)	(1,483)		(2,256)
Total recognized in net periodic benefit cost and accumulated other comprehensive loss	$ 856	$ 1,209	$ 1,712		$ 2,419

[1] The decrease in interest cost is primarily due to the election made at the end of 2015 to adopt the spot-rate approach to determine the interest cost component of pension and postretirement expense.