Pension and Other Postretirement Plans (Amounts Recognized in Balance Sheet and AOCI) (Details) - USD ($) $ in Thousands	Dec. 03, 2016	Nov. 28, 2015	Jan. 01, 2007
Amounts recognized in the Consolidated Balance Sheets as of November 30
Long-term pension and postretirement healthcare benefits liabilities	$ (37,175)	$ (31,577)
Pension Plan [Member]
Amounts recognized in the Consolidated Balance Sheets as of November 30
Accounts payable and accrued liabilities	(157)	(159)
Long-term pension and postretirement healthcare benefits liabilities	(36,511)	(30,869)
Funded status	(36,668)	(31,028)
Accumulated other comprehensive loss, pre-tax	62,974	58,137
Amounts recognized in Accumulated Other Comprehensive Loss, as of November 30
Unrecognized net actuarial loss (gain)	62,974	58,136
Unrecognized net prior service credit	0	1
Accumulated other comprehensive loss, pre-tax	62,974	58,137
Deferred taxes	(23,127)	(21,380)
Accumulated other comprehensive loss, after-tax	39,847	36,757
Other Postretirement Benefit Plans, Defined Benefit [Member]
Amounts recognized in the Consolidated Balance Sheets as of November 30
Accounts payable and accrued liabilities	(40)	(47)
Long-term pension and postretirement healthcare benefits liabilities	(254)	(294)
Funded status	(294)	(341)
Accumulated other comprehensive loss, pre-tax	(1,060)	(1,214)
Amounts recognized in Accumulated Other Comprehensive Loss, as of November 30
Unrecognized net actuarial loss (gain)	(832)	(864)
Unrecognized net prior service credit	(228)	(350)	$ 1,708
Accumulated other comprehensive loss, pre-tax	(1,060)	(1,214)
Deferred taxes	364	423
Accumulated other comprehensive loss, after-tax	$ (696)	$ (791)