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Principles of Consolidation [Abstract]

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Revenue earned during the period arising from products sold or services provided under the terms of a contract, not elsewhere specified in the taxonomy. May include government contracts, construction contracts, and any other contract related to a particular project or product.

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Amount classified as property, plant and equipment attributable to disposal group held for sale or disposed of, expected to be disposed of after one year or the normal operating cycle, if longer.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Duration of a fiscal period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but not limited to, weeks in a year or quarter.

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations.

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Cash and equivalents whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Basis of Presentation and Significant Accounting Policies (Narrative) (Details)	12 Months Ended
	Nov. 28, 2015 USD ($) segment	Nov. 29, 2014 USD ($)	Nov. 30, 2013 USD ($)
Principles of Consolidation
Number of segments \| segment	3
Accounting Period
Fiscal Period Duration	364 days	364 days	364 days
Foreign Currency Translation and Transactions
Foreign currency transaction gain (loss)	$ (215,000)	$ 1,251,000	$ (520,000)
Cash and Cash Equivalents and Restricted Cash
Restricted cash, current	0	0
Restricted cash, noncurrent	1,294,000	1,294,000
Property, Plant and Equipment
Asset held for sale	$ 533,000	0
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	$ 42,338,000	35,537,000	42,002,000
Research and Development Expense
Research and development expense	21,650,000	18,102,000	$ 11,334,000
Guarantees
Letters of credit outstanding, amount	24,581,000	33,359,000
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Unamortized debt issuance cost	$ 2,756,000	$ 1,114,000
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