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Common Stock - Share-based Compensation (Details) - USD ($)	12 Months Ended
	Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013	Oct. 23, 2014	Feb. 13, 2014	Aug. 10, 2012
Share-Based Compensation
Share-based compensation expense	$ 5,800,000	$ 5,300,000	$ 2,900,000
Non-employee compensation expense	11,000	271,000	147,000
Adjustments Related to Tax Withholding for Share-based Compensation	$ 668,000	$ 1,222,000	$ 730,000
Common Stock Repurchases and Retirements
Share repurchase program, amount authorized to be repurchased				$ 30,000,000	$ 15,000,000	$ 5,000,000
Number of shares repurchased and retired	477,292	971,515	118,968
Aggregate price of shares repurchased and retired	$ 12,806,000	$ 25,492,000	$ 2,190,000
Amount available for future repurchases	$ 8,100,000	$ 20,900,000	$ 23,100,000
Restricted shares
Share-Based Compensation
Vested (in shares)	106,504	149,195	134,384
Redemption of vested restricted shares in order to pay employee tax withholdings (in shares)	28,900	41,470	37,642
Adjustments Related to Tax Withholding for Share-based Compensation	$ 700,000	$ 1,200,000	$ 700,000
Employees and directors
Share-Based Compensation
Share-based compensation expense	$ 5,800,000	$ 5,300,000	$ 2,900,000

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The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F

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Fair value of share-based compensation granted to nonemployees as payment for services rendered or acknowledged claims.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased and retired during the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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