Fair Value of Financial Instruments - Summary of financial instruments (Details) - USD ($) $ in Thousands	Oct. 02, 2021	Jan. 02, 2021
Financial assets and liabilities measured at fair value on a recurring basis
Short-term investments	$ 1,364,095	$ 521,963
Recurring
Financial assets and liabilities measured at fair value on a recurring basis
Cash equivalents	1,152,276	95,520
Short-term investments	1,364,095	521,963
Other assets, net	5,100	5,340
Total assets at fair value	2,521,471	622,823
Recurring | Money market funds
Financial assets and liabilities measured at fair value on a recurring basis
Cash equivalents	1,126,821	75,606
Recurring | Corporate debt securities
Financial assets and liabilities measured at fair value on a recurring basis
Cash equivalents	25,455	14,995
Short-term investments	883,785	379,390
Recurring | Government debt securities
Financial assets and liabilities measured at fair value on a recurring basis
Cash equivalents		4,919
Short-term investments	480,310	142,573
Recurring | Auction rate securities
Financial assets and liabilities measured at fair value on a recurring basis
Other assets, net	5,100	5,340
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets and liabilities measured at fair value on a recurring basis
Cash equivalents	1,126,821	77,961
Short-term investments	378,439	38,461
Total assets at fair value	1,505,260	116,422
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds
Financial assets and liabilities measured at fair value on a recurring basis
Cash equivalents	1,126,821	75,606
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Government debt securities
Financial assets and liabilities measured at fair value on a recurring basis
Cash equivalents		2,355
Short-term investments	378,439	38,461
Recurring | Significant Other Observable Inputs (Level 2)
Financial assets and liabilities measured at fair value on a recurring basis
Cash equivalents	25,455	17,559
Short-term investments	985,656	483,502
Total assets at fair value	1,011,111	501,061
Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities
Financial assets and liabilities measured at fair value on a recurring basis
Cash equivalents	25,455	14,995
Short-term investments	883,785	379,390
Recurring | Significant Other Observable Inputs (Level 2) | Government debt securities
Financial assets and liabilities measured at fair value on a recurring basis
Cash equivalents		2,564
Short-term investments	101,871	104,112
Recurring | Significant Unobservable Inputs (Level 3)
Financial assets and liabilities measured at fair value on a recurring basis
Other assets, net	5,100	5,340
Total assets at fair value	5,100	5,340
Recurring | Significant Unobservable Inputs (Level 3) | Auction rate securities
Financial assets and liabilities measured at fair value on a recurring basis
Other assets, net	$ 5,100	$ 5,340