Fair Value of Financial Instruments - Summary of financial instruments (Details) - USD ($) $ in Thousands	Jan. 01, 2022	Jan. 02, 2021
Financial assets and liabilities measured at fair value on a recurring basis
Short-term investments	$ 964,582	$ 521,963
Recurring
Financial assets and liabilities measured at fair value on a recurring basis
Cash equivalents	852,242	95,520
Short-term investments	964,582	521,963
Other assets, net	4,980	5,340
Total assets at fair value	1,821,804	622,823
Recurring | Money market funds
Financial assets and liabilities measured at fair value on a recurring basis
Cash equivalents	845,740	75,606
Recurring | Corporate debt securities
Financial assets and liabilities measured at fair value on a recurring basis
Cash equivalents	3,552	14,995
Short-term investments	773,461	379,390
Recurring | Government debt securities
Financial assets and liabilities measured at fair value on a recurring basis
Cash equivalents	2,950	4,919
Short-term investments	191,121	142,573
Recurring | Auction rate securities
Financial assets and liabilities measured at fair value on a recurring basis
Other assets, net	4,980	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	845,740	77,961
Short-term investments	71,509	38,461
Total assets at fair value	917,249	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	845,740	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	71,509	38,461
Recurring | Significant Other Observable Inputs (Level 2)
Financial assets and liabilities measured at fair value on a recurring basis
Cash equivalents	6,502	17,559
Short-term investments	893,073	483,502
Total assets at fair value	899,575	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	3,552	14,995
Short-term investments	773,461	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	2,950	2,564
Short-term investments	119,612	104,112
Recurring | Significant Unobservable Inputs (Level 3)
Financial assets and liabilities measured at fair value on a recurring basis
Other assets, net	4,980	5,340
Total assets at fair value	4,980	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	$ 4,980	$ 5,340