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Employee Benefits - Fair Value of Total Assets By Category (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Asset allocation structure of the portfolio
Percentage of fair value of total assets by asset category	100.00%	100.00%
Fair value of plan assets by asset category	$ 79,087	$ 78,264	$ 80,192
Level 1
Asset allocation structure of the portfolio
Fair value of plan assets by asset category	$ 79,087	$ 78,264
Equity securities — domestic
Asset allocation structure of the portfolio
Percentage of fair value of total assets by asset category	49.00%	59.00%
Equity securities — domestic | Level 1
Asset allocation structure of the portfolio
Fair value of plan assets by asset category	$ 38,417	$ 46,087
Equity securities — international
Asset allocation structure of the portfolio
Percentage of fair value of total assets by asset category	12.00%	14.00%
Equity securities — international | Level 1
Asset allocation structure of the portfolio
Fair value of plan assets by asset category	$ 9,717	$ 10,912
Fixed income
Asset allocation structure of the portfolio
Percentage of fair value of total assets by asset category	38.00%	24.00%
Fixed income | Level 1
Asset allocation structure of the portfolio
Fair value of plan assets by asset category	$ 30,493	$ 18,792
Other
Asset allocation structure of the portfolio
Percentage of fair value of total assets by asset category	1.00%	3.00%
Other | Level 1
Asset allocation structure of the portfolio
Fair value of plan assets by asset category	$ 460	$ 2,473

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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Section 35
-Paragraph 50
-URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12355-114930

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Plan Assets
-URI http://asc.fasb.org/extlink&oid=6749337

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920

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