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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Fair Value Hierarchy for Financial Assets (Details) - USD ($) | Jun. 29, 2019 | Dec. 29, 2018 | Jun. 30, 2018
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents | $ 408,784,000 | $ 552,490,000 | $ 429,647,000
Short-term investments | 180,000,000.0 | $ 0 |
Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 588,784,000 |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 0 |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  |
Available-for-sale Securities | 588,784,000 |  |
Cash and cash equivalents | 408,784,000 |  |
Short-term investments | 180,000,000 |  |
Recurring | Cash and Cash Equivalents |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 408,784,000 |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 0 |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  |
Available-for-sale Securities | 408,784,000 |  |
Cash and cash equivalents | 408,784,000 |  |
Short-term investments | 0 |  |
Recurring | Fair Value, Inputs, Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 180,000,000 |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 0 |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  |
Available-for-sale Securities | 180,000,000 |  |
Cash and cash equivalents | 0 |  |
Short-term investments | 180,000,000 |  |
Recurring | Fair Value, Inputs, Level 1 | Certificates of Deposit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 180,000,000 |  |
Available-for-sale Securities | 180,000,000 |  |
Short-term investments | 180,000,000 |  |
Recurring | Fair Value, Inputs, Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 0 |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 0 |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  |
Available-for-sale Securities | 0 |  |
Cash and cash equivalents | 0 |  |
Short-term investments | 0 |  |
Recurring | Fair Value, Inputs, Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 0 |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 0 |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  |
Available-for-sale Securities | 0 |  |
Cash and cash equivalents | 0 |  |
Short-term investments | $ 0 |  |

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