Income Taxes (Details 6) (USD $) In Thousands, unless otherwise specified	Dec. 03, 2011	Nov. 27, 2010
Deferred tax assets:
Deferred compensation	$ 8,260	$ 7,590
Loss carryforward and tax credit items	3,265	3,146
Accounts receivable	5,840	6,092
Inventories	5,069	4,532
Pensions	26,643	24,036
Accrued liabilities and other	9,591	9,181
Valuation allowance	(1,959)	(1,658)
Total deferred tax assets, net	56,709	52,919
Deferred tax liabilities:
Percentage of completion	(468)	(413)
Plant assets	(27,616)	(21,202)
Goodwill and acquired intangible assets	(37,483)	(35,958)
Other deferred tax liabilities	(613)	(531)
Total deferred tax liabilities	66,180	58,104
Deferred tax liability, net	$ (9,471)	$ (5,185)