The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

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- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

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)(1)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Shareholders' Equity and Stock-Based Compensation (Details 2) - $ / shares shares in Thousands	12 Months Ended
	Dec. 28, 2017	Dec. 29, 2016	Dec. 31, 2015	May 28, 2015	May 29, 2014
Options outstanding	1,629	1,563	1,707	1,526	1,566
Weighted-average exercise price of options outstanding	$ 18.08	$ 15.94	$ 15.71	$ 14.75	$ 14.06
Weighted-average remaining contractual life of options outstanding	5 years 7 months 6 days
Options exercisable	988	904	961	840
Weighted-average exercise price of options exercisable	$ 14.69	$ 14.28	$ 14.57	$ 14.9
Exercise Price Range 10.00 to 13.12
Options outstanding	526
Weighted-average exercise price of options outstanding	$ 12.13
Weighted-average remaining contractual life of options outstanding	4 years 2 months 12 days
Options exercisable	489
Weighted-average exercise price of options exercisable	$ 12.06
Exercise Price Range 13.13 to 18.34
Options outstanding	454
Weighted-average exercise price of options outstanding	$ 16.24
Weighted-average remaining contractual life of options outstanding	3 years 6 months
Options exercisable	371
Weighted-average exercise price of options exercisable	$ 15.79
Exercise Price Range 18.35 to 31.55
Options outstanding	649
Weighted-average exercise price of options outstanding	$ 24.19
Weighted-average remaining contractual life of options outstanding	8 years 3 months 18 days
Options exercisable	128
Weighted-average exercise price of options exercisable	$ 21.49