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Summary of Significant Accounting Policies - Accounting Changes and Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Oct. 29, 2017 | Dec. 31, 2016 | Oct. 30, 2016 | [1] | Oct. 25, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Realized windfalls reclassified from financing activities to operating activities |  | $ 29,513 |  | $ 47,657 | $ 22,950
Reclassification | Accounting Standards Update 2016-09 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Realized windfalls reclassified from financing activities to operating activities | $ 29,500 |  | $ 47,700 |  |
[1] | Fiscal 2016 included 53 weeks

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