Employee Benefit Plans (Details) - USD ($) $ in Thousands		3 Months Ended
		Feb. 28, 2016	Mar. 01, 2015
Pension Benefits [Member]
Net periodic benefit cost (income):
Service cost		$ 2,058	$ 2,128
Interest cost	[1]	9,472	11,840
Expected return on plan assets		(12,134)	(12,717)
Amortization of prior service benefit		(15)	(16)
Amortization of actuarial loss		3,007	3,160
Curtailment loss		0	335
Net periodic benefit cost		2,388	4,730
Changes in accumulated other comprehensive loss:
Actuarial gain (loss)		152	0
Amortization of prior service benefit		15	16
Amortization of actuarial loss		(3,007)	(3,160)
Curtailment loss		0	(335)
Total recognized in accumulated other comprehensive loss		(2,840)	(3,479)
Total recognized in net periodic benefit cost and accumulated other comprehensive loss		(452)	1,251
Postretirement Benefits [Member]
Net periodic benefit cost (income):
Service cost		50	63
Interest cost	[1]	806	1,147
Expected return on plan assets		0	0
Amortization of prior service benefit		0	0
Amortization of actuarial loss		742	1,128
Curtailment loss		0	0
Net periodic benefit cost		1,598	2,338
Changes in accumulated other comprehensive loss:
Actuarial gain (loss)		0	0
Amortization of prior service benefit		0	0
Amortization of actuarial loss		(742)	(1,128)
Curtailment loss		0	0
Total recognized in accumulated other comprehensive loss		(742)	(1,128)
Total recognized in net periodic benefit cost and accumulated other comprehensive loss		$ 856	$ 1,210

[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.