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Stock-Based Compensation - 2009 Employee Stock Purchase Plan (Details) - 2009 Employee Stock Purchase Plan - $ / shares shares in Thousands | 12 Months Ended
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Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Stock-Based Compensation |  |  |
Minimum exercise price as percentage of fair market value of shares on the date of grant | 85.00% |  |
Term of award | 24 months | 24 months | 24 months
Shares issued | 223 | 239 | 224
Weighted average fair value for purchase rights granted (in dollars per share) | $ 22.59 |  |

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- Definition 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. + References No definition available. + Details
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- Definition Weighted average purchase price of capital shares purchased through an employee stock ownership plan. + References No definition available. + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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