Cash, Cash Equivalents, and Investments - Effective Maturity Dates of Available-for-Sale Investments (Details) $ in Thousands	Sep. 27, 2020 USD ($)
Debt Securities, Available-for-sale [Line Items]
1 year or less	$ 95,365
1-2 years	311,825
2-3 years	296,554
3-4 years	6,979
4-5 years	3,985
Fair value	714,708
Corporate Bonds
Debt Securities, Available-for-sale [Line Items]
1 year or less	43,436
1-2 years	86,619
2-3 years	126,966
3-4 years	2,866
4-5 years	0
Fair value	259,887
Treasury Bills
Debt Securities, Available-for-sale [Line Items]
1 year or less	0
1-2 years	167,677
2-3 years	98,353
3-4 years	4,061
4-5 years	0
Fair value	270,091
Asset-Backed Securities
Debt Securities, Available-for-sale [Line Items]
1 year or less	34,536
1-2 years	45,513
2-3 years	45,457
3-4 years	52
4-5 years	3,985
Fair value	129,543
Sovereign Bonds
Debt Securities, Available-for-sale [Line Items]
1 year or less	16,086
1-2 years	4,973
2-3 years	3,437
3-4 years	0
4-5 years	0
Fair value	24,496
Agency Bonds
Debt Securities, Available-for-sale [Line Items]
1 year or less	0
1-2 years	5,933
2-3 years	22,341
3-4 years	0
4-5 years	0
Fair value	28,274
Municipal Bonds
Debt Securities, Available-for-sale [Line Items]
1 year or less	1,307
1-2 years	1,110
2-3 years	0
3-4 years	0
4-5 years	0
Fair value	$ 2,417