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Basis of Presentation and Significant Accounting Policies (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Nov. 29, 2014 segments	Nov. 30, 2013	Dec. 01, 2012
Principles of Consolidation
Number of segments	3us-gaap_NumberOfReportableSegments
Accounting Period
Fiscal Period Duration	364 days	364 days	364 days
Foreign Currency Translation and Transactions
Foreign currency transaction gain (loss)	$ 1,251	$ (520)	$ (847)
Cash and Cash Equivalents and Restricted Cash
Restricted cash, noncurrent	1,294	1,896
Stock-based Compensation
Recognition period of compensation expenses from date of grant (in years)	4 years
Revenue Recognition
Revenue recognized under percentage of completion method	35,537us-gaap_ContractsRevenue	42,002us-gaap_ContractsRevenue	34,466us-gaap_ContractsRevenue
Research and Development Expense
Research and development expense	18,102us-gaap_ResearchAndDevelopmentExpense	11,334us-gaap_ResearchAndDevelopmentExpense	11,811us-gaap_ResearchAndDevelopmentExpense
Guarantees
Letters of credit outstanding, amount	$ 33,359	$ 28,541
Patents [Member] \| Weighted Average [Member]
Goodwill and Acquired Intangible Assets
Useful life of intangible assets (in years)	14 years
Other Acquired Intangibles [Member] \| Minimum [Member]
Goodwill and Acquired Intangible Assets
Useful life of intangible assets (in years)	1 year
Other Acquired Intangibles [Member] \| Maximum [Member]
Goodwill and Acquired Intangible Assets
Useful life of intangible assets (in years)	30 years
Building and Building Improvements [Member] \| Minimum [Member]
Property, Plant and Equipment
Useful life of property, plant and equipment (in years)	15 years
Building and Building Improvements [Member] \| Maximum [Member]
Property, Plant and Equipment
Useful life of property, plant and equipment (in years)	40 years
Machinery and Equipment [Member] \| Minimum [Member]
Property, Plant and Equipment
Useful life of property, plant and equipment (in years)	3 years
Machinery and Equipment [Member] \| Maximum [Member]
Property, Plant and Equipment
Useful life of property, plant and equipment (in years)	15 years