Basis of Presentation and Significant Accounting Policies (Narrative) (Details)		12 Months Ended
	Dec. 01, 2016 $ / shares	Dec. 03, 2016 USD ($) segment $ / shares	Nov. 28, 2015 USD ($) $ / shares	Nov. 29, 2014 USD ($)
Principles of Consolidation
Number of segments | segment		3
Business Combinations [Abstract]
Common stock, par value (in USD per share) | $ / shares		$ 1	$ 1
Accounting Period
Number of days in the reporting period		371 days	364 days	364 days
Foreign Currency Translation and Transactions
Foreign currency transaction gain (loss)		$ 672,000	$ (215,000)	$ 1,251,000
Cash and Cash Equivalents and Restricted Cash
Restricted cash, current		143,000	0
Restricted cash, noncurrent		1,294,000	1,294,000
Property, Plant and Equipment
Asset held for sale		533,000	533,000
Asset Impairment Charges [Abstract]
Impairment charges		$ 0	0	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		$ 37,075,000	42,338,000	35,537,000
Research and Development Expense
Research and development expense		26,345,000	21,650,000	$ 18,102,000
Guarantees
Letters of credit outstanding, amount		18,191,000	24,581,000
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Unamortized debt issuance cost		1,988,000	$ 2,756,000
Billings in Excess of Cost		$ 2,167,000
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
Parker-Hannifin Corporation [Member]
Business Combinations [Abstract]
Common stock, par value (in USD per share) | $ / shares	$ 1.00
Common stock conversion price (USD per share) | $ / shares	$ 83.00