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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Fair Value Hierarchy for Financial Assets (Details) - USD ($)	Jun. 27, 2020	Dec. 28, 2019	Jun. 29, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 631,881,000	$ 567,687,000	$ 408,784,000
Short-term investments	50,000,000.0	120,000,000
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Amortized Cost Basis	681,881,000	687,687,000
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale Securities	681,881,000	687,687,000
Cash and cash equivalents	631,881,000	567,687,000
Short-term investments	50,000,000	120,000,000
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	631,881,000	567,687,000
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale Securities	631,881,000	567,687,000
Cash and cash equivalents	631,881,000	567,687,000
Short-term investments	0	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	50,000,000	120,000,000
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale Securities	50,000,000	120,000,000
Cash and cash equivalents	0	0
Short-term investments	50,000,000	120,000,000
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	50,000,000	120,000,000
Available-for-sale Securities	50,000,000	120,000,000
Short-term investments	50,000,000	120,000,000
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	0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale Securities	0	0
Cash and cash equivalents	0
Short-term investments	0	0
Recurring | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Amortized Cost Basis	0	0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale Securities	0	0
Cash and cash equivalents	0
Short-term investments	$ 0	$ 0

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