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Nature of Operations and Summary of Significant Accounting Policies (Details) (USD $) | 12 Months Ended
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Dec. 28, 2013 Segment | Dec. 29, 2012 | Dec. 31, 2011
Nature of Operations and Summary of Significant Accounting Policies [Abstract] |  |  |
Number of reportable segments | 2 |  |
Revenue Recognition and Accounts Receivable [Abstract] |  |  |
Percentage of completion revenue | $ 19,758,000 | $ 42,190,000 | $ 29,207,000
Banker's acceptance drafts | 10,765,000 | 9,794,000 |
Changes in the carrying amount of accrued warranty costs [Roll Forward] |  |  |
Balance at beginning of year | 4,462,000 | 4,129,000 |
Provision charged to income | 1,565,000 | 1,775,000 |
Usage | (2,114,000) | (1,544,000) |
Acquired | 567,000 | 0 |
Currency translation | 91,000 | 102,000 |
Balance at end of year | 4,571,000 | 4,462,000 | 4,129,000
Restricted Cash [Abstract] |  |  |
Restricted cash | 168,000 | 0 |
Supplemental Cash Flow Information [Abstract] |  |  |
Cash Paid for Interest | 961,000 | 856,000 | 1,106,000
Cash Paid for Income Taxes | 8,375,000 | 9,326,000 | 6,677,000
Non-Cash Investing Activities [Abstract] |  |  |
Fair value of assets acquired | 88,398,000 | 0 | 21,808,000
Cash paid for acquired businesses | (67,453,000) | 0 | (16,104,000)
Liabilities assumed of acquired businesses | 20,945,000 | 0 | 5,704,000
Non-Cash Financing Activities [Abstract] |  |  |
Issuance of company common stock | 2,677,000 | 2,106,000 | 2,296,000
Dividends Declared but Unpaid | 1,389,000 | 0 | 0
Inventories [Abstract] |  |  |
Raw materials and supplies | 20,836,000 | 19,561,000 |
Work in process | 21,051,000 | 8,371,000 |
Finished goods | 20,918,000 | 14,145,000 |
Inventories | 62,805,000 | 42,077,000 |
Finished goods at customer locations | 2,941,000 | 2,310,000 |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | 117,997,000 | 109,046,000 |
Less: accumulated depreciation and amortization | 73,112,000 | 69,878,000 |
Property, plant and equipment, net | 44,885,000 | 39,168,000 |
Depreciation and amortization expense | 5,088,000 | 5,015,000 | 4,953,000
Land [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | 4,797,000 | 3,968,000 |
Buildings [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | 38,363,000 | 36,823,000 |
Buildings [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 10 years |  |
Buildings [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 40 years |  |
Machinery and Equipment [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 2 years |  |
Machinery and Equipment [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 10 years |  |
Machinery, Equipment and Leasehold Improvements [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | 74,837,000 | 68,255,000 |
Composites LLC [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Amount paid for lawsuit claim |  | $ 647,000 |

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- Definition The percentage of completion is determined by comparing the actual costs incurred to date to an estimate of total costs to be incurred on each contract. If a loss is indicated on any contract in process, a provision is made currently for the entire loss. The Company's contracts generally provide for billing of customers upon the attainment of certain milestones specified in each contract. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition 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 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. This element is for unclassified presentations; for classified presentations there is a separate and distinct element. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 80 -Subparagraph Exhibit 4-8, 3 -IssueDate 2006-05-01 -Chapter 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 + Details
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- Definition Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 45 -Paragraph 14 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c)(1),(c)(5) -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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- Definition Increase or Decrease in standard product warranty liability due to currency translation. Does not include any Increase or Decrease in an extended product warranty liability due to currency translation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 45 -Paragraph 14 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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- Definition Represents the aggregate decrease in the liability for payments made (in cash or in kind) to satisfy claims under the terms of the standard product warranty. Does not include any Increase or Decrease in the liability for payments related to extended product warranties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 45 -Paragraph 14 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(2)) -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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