Pension and Other Postretirement Plans (Amounts Recognized in Balance Sheet and AOCI) (Details) - USD ($) $ in Thousands	Nov. 28, 2015	Nov. 29, 2014	Jan. 01, 2007
Amounts recognized in the Consolidated Balance Sheets as of November 30
Long-term pension and postretirement healthcare benefits liabilities	$ (31,577)	$ (33,266)
Pension Plan [Member]
Amounts recognized in the Consolidated Balance Sheets as of November 30
Accounts payable and accrued liabilities	(159)	(221)
Long-term pension and postretirement healthcare benefits liabilities	(30,869)	(32,481)
Funded status	(31,028)	(32,702)
Accumulated other comprehensive loss, pre-tax	58,137	61,096
Amounts recognized in Accumulated Other Comprehensive Loss, as of November 30
Unrecognized net actuarial loss (gain)	58,136	61,098
Unrecognized net prior service credit	1	(2)
Accumulated other comprehensive loss, pre-tax	58,137	61,096
Deferred taxes	(21,380)	(22,535)
Accumulated other comprehensive loss, after-tax	36,757	38,561
Other Postretirement Benefit Plans, Defined Benefit [Member]
Amounts recognized in the Consolidated Balance Sheets as of November 30
Accounts payable and accrued liabilities	(47)	(59)
Long-term pension and postretirement healthcare benefits liabilities	(294)	(338)
Funded status	(341)	(397)
Accumulated other comprehensive loss, pre-tax	(1,214)	(1,346)
Amounts recognized in Accumulated Other Comprehensive Loss, as of November 30
Unrecognized net actuarial loss (gain)	(864)	(873)
Unrecognized net prior service credit	(350)	(473)	$ 1,708
Accumulated other comprehensive loss, pre-tax	(1,214)	(1,346)
Deferred taxes	423	475
Accumulated other comprehensive loss, after-tax	$ (791)	$ (871)