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Cash and Investments - Investments by Security Type (Details) - USD ($) $ in Thousands	Apr. 03, 2020	Jan. 03, 2020
Debt Securities, Available-for-sale [Line Items]
Investments, available-for-sale, Amortized Cost	$ 1,111,837	$ 1,308,351
Investments available-for-sale, Gross Unrealized Gains	3,332	4,121
Investments available-for-sale, Gross Unrealized Losses	(3,448)	(8)
Investments available-for-sale, Fair Value	1,111,721	1,312,464
Cash, cash equivalents, restricted cash and restricted cash equivalents and available-for-sale debt securities, amortized cost	1,440,518	1,384,510
Cash, cash equivalents, restricted cash and restricted cash equivalents and available-for-sale debt securities, gross unrealized gains	3,334	4,126
Cash, cash equivalents, restricted cash and restricted cash equivalents and available-for-sale debt securities, gross unrealized losses	3,448	8
Cash, cash equivalents, restricted cash and restricted cash equivalents and available-for-sale debt securities	1,440,404	1,388,628
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Investments, available-for-sale, Amortized Cost	202,452	389,573
Investments available-for-sale, Gross Unrealized Gains	0	0
Investments available-for-sale, Gross Unrealized Losses	0	0
Investments available-for-sale, Fair Value	202,452	389,573
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Investments, available-for-sale, Amortized Cost	741,315	752,295
Investments available-for-sale, Gross Unrealized Gains	2,404	3,934
Investments available-for-sale, Gross Unrealized Losses	(3,448)	(3)
Investments available-for-sale, Fair Value	740,271	756,226
U.S. Treasury and government-sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Investments, available-for-sale, Amortized Cost	152,922	166,483
Investments available-for-sale, Gross Unrealized Gains	788	187
Investments available-for-sale, Gross Unrealized Losses	0	(5)
Investments available-for-sale, Fair Value	153,710	166,665
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Investments, available-for-sale, Amortized Cost	15,148
Investments available-for-sale, Gross Unrealized Gains	140
Investments available-for-sale, Gross Unrealized Losses	0
Investments available-for-sale, Fair Value	15,288
Cash
Debt Securities, Available-for-sale [Line Items]
Cash, cash equivalents, restricted cash and restricted cash equivalents, amortized cost	8,905	40,964
Cash, cash equivalents, restricted cash and restricted cash equivalents, gross unrealized gain	0	0
Cash, cash equivalents, restricted cash and restricted cash equivalents, gross unrealized loss	0	0
Cash, cash equivalents, restricted cash and restricted cash equivalents	8,905	40,964
Money market funds
Debt Securities, Available-for-sale [Line Items]
Cash, cash equivalents, restricted cash and restricted cash equivalents, amortized cost	273,497	2,467
Cash, cash equivalents, restricted cash and restricted cash equivalents, gross unrealized gain	0	0
Cash, cash equivalents, restricted cash and restricted cash equivalents, gross unrealized loss	0	0
Cash, cash equivalents, restricted cash and restricted cash equivalents	273,497	2,467
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Cash, cash equivalents, restricted cash and restricted cash equivalents, amortized cost	46,279	32,728
Cash, cash equivalents, restricted cash and restricted cash equivalents, gross unrealized gain	2	5
Cash, cash equivalents, restricted cash and restricted cash equivalents, gross unrealized loss	0	0
Cash, cash equivalents, restricted cash and restricted cash equivalents	$ 46,281	$ 32,733

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