Pension and Other Postretirement Plans (Amounts Affecting Accumulated Other Comprehensive Income Loss) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Nov. 29, 2014	Nov. 30, 2013	Dec. 01, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Total	$ 7,789	$ (21,029)	$ 6,234
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Amortization of prior service (cost) credit, net of tax of $(5), $(6) and $(43), $(44), respectively	5	3
Amortization of actuarial (losses) gains, net of tax of $1,063, $3,060 and $(52), $(54), respectively	(1,821)	(5,498)
Current year actuarial losses (gains), net of tax of $(5,559), $9,304 and $(6), $26, respectively	9,509	(16,637)
Effect of change in deferred tax rate	(78)	982
Total	7,615	(21,150)
Defined Benefit Plan, Tax Amounts
Amortization of prior service (cost) credit, tax amount	(5)	(6)
Amortization of actuarial (losses) gains, tax amount	1,063	3,060
Current year actuarial losses (gains), tax amount	(5,559)	9,304
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Amortization of prior service (cost) credit, net of tax of $(5), $(6) and $(43), $(44), respectively	79	79
Amortization of actuarial (losses) gains, net of tax of $1,063, $3,060 and $(52), $(54), respectively	95	95
Current year actuarial losses (gains), net of tax of $(5,559), $9,304 and $(6), $26, respectively	11	(46)
Effect of change in deferred tax rate	(11)	(7)
Total	174	121
Defined Benefit Plan, Tax Amounts
Amortization of prior service (cost) credit, tax amount	(43)	(44)
Amortization of actuarial (losses) gains, tax amount	(52)	(54)
Current year actuarial losses (gains), tax amount	$ (6)	$ 26