Pension and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Income) and Contributions (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 28, 2016	May 30, 2015	May 28, 2016	May 30, 2015
Amortization of unrecognized:
Cash contributions	$ 29		$ 101
Pension Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	371	$ 534	742	$ 1,069
Interest cost	1,559	1,871	3,119	3,747
Expected return on plan assets	(2,588)	(2,917)	(5,178)	(5,843)
Amortization of unrecognized:
Prior service cost	0	(1)	0	(2)
Net actuarial loss (gain)	956	966	1,912	1,934
Net periodic benefit cost	298	453	595	905
Cash contributions	18	117	79	253
Postretirement Healthcare Benefit Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Interest cost	2	2	4	4
Amortization of unrecognized:
Prior service cost	(31)	(31)	(62)	(62)
Net actuarial loss (gain)	(23)	(37)	(46)	(74)
Net periodic benefit cost	(52)	(66)	(104)	(132)
Cash contributions	$ 11	$ 15	$ 22	$ 30