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Summary of Significant Accounting Policies - Fair Value Hierarchy for Financial Assets (Detail) - USD ($)	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 641,447,000	$ 567,687,000	$ 552,490,000
Short-term investments	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	641,447,000	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	641,447,000	687,687,000
Cash and cash equivalents	641,447,000	567,687,000
Short-term investments	0	120,000,000
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	0	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	0	120,000,000
Cash and cash equivalents	0	0
Short-term investments	0	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	0
Short-term investments	0	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	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	0
Short-term investments	0	0
Cash and Cash Equivalents | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Amortized Cost Basis	641,447,000	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	641,447,000	567,687,000
Cash and cash equivalents	641,447,000	567,687,000
Short-term investments	$ 0	0
Certificates of Deposit | 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		120,000,000
Available-for-sale Securities		120,000,000
Short-term investments		$ 120,000,000

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