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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 |  |  |  |

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