Research, Development and Engineering Costs (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 30, 2016	Jan. 01, 2016	Jan. 02, 2015
Research and development expense [Line Items]
Total research, development and engineering costs, net	$ 55,001	$ 52,995	$ 49,845
Research, Development, and Engineering Costs [Member]
Research and development expense [Line Items]
Total research, development and engineering costs, net	61,175	59,767	58,974
Customer Cost Reimbursements [Member]
Research and development expense [Line Items]
Total research, development and engineering costs, net	$ 6,174	$ 6,772	$ 9,129

The costs incurred 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 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, excluding in-process research and development acquired in a business combination consummated during the period. Excludes software research and development, which has a separate concept.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 730
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Research and Development
-URI http://asc.fasb.org/extlink&oid=6523717

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration