Pension and Other Postretirement Plans (Amounts Affecting Accumulated Other Comprehensive Income Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 03, 2016	Nov. 28, 2015	Nov. 29, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Total	$ 3,148	$ (1,664)	$ 7,789
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Amortization of prior service (cost) credit, net of tax of $0, $(2) and $(42), $(43), respectively	(1)	0
Amortization of actuarial (losses) gains, net of tax of $1,401, $1,351 and $(32), $(30), respectively	(2,485)	(2,324)
Current year actuarial losses (gains), net of tax of $(3,159), $(1,081) and $21, $27, respectively	5,498	1,827
Curtailment gain, net of tax of $0, $797 and $0, $0, respectively	0	(1,396)
Effect of change in deferred tax rate	41	150
Total	3,053	(1,743)
Defined Benefit Plan, Tax Amounts
Amortization of prior service (cost) credit, tax amount	0	(2)
Amortization of actuarial (losses) gains, tax amount	1,401	1,351
Current year actuarial losses (gains), tax amount	(3,159)	(1,081)
Curtailment gain, tax amount	0	797
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 $0, $(2) and $(42), $(43), respectively	81	79
Amortization of actuarial (losses) gains, net of tax of $1,401, $1,351 and $(32), $(30), respectively	62	57
Current year actuarial losses (gains), net of tax of $(3,159), $(1,081) and $21, $27, respectively	(40)	(51)
Curtailment gain, net of tax of $0, $797 and $0, $0, respectively	0	0
Effect of change in deferred tax rate	(8)	(6)
Total	95	79
Defined Benefit Plan, Tax Amounts
Amortization of prior service (cost) credit, tax amount	(42)	(43)
Amortization of actuarial (losses) gains, tax amount	(32)	(30)
Current year actuarial losses (gains), tax amount	21	27
Curtailment gain, tax amount	$ 0	$ 0