Cash, Cash Equivalents, and Investments - Effective Maturity Dates of Available-for-Sale Investments (Detail) $ in Thousands	Sep. 29, 2019 USD ($)
Debt Securities, Available-for-sale [Line Items]
1 year or less	$ 292,072
1-2 years	341,764
2-3 years	149,413
3-4 years	8,981
4-5 years	4,483
Fair value	796,713
Corporate Bonds
Debt Securities, Available-for-sale [Line Items]
1 year or less	87,209
1-2 years	115,941
2-3 years	47,842
3-4 years	1,348
4-5 years	2,867
Fair value	255,207
Treasury Bills
Debt Securities, Available-for-sale [Line Items]
1 year or less	105,454
1-2 years	188,398
2-3 years	68,217
3-4 years	0
4-5 years	0
Fair value	362,069
Asset-Backed Securities
Debt Securities, Available-for-sale [Line Items]
1 year or less	89,576
1-2 years	21,425
2-3 years	26,142
3-4 years	7,633
4-5 years	1,616
Fair value	146,392
Sovereign Bonds
Debt Securities, Available-for-sale [Line Items]
1 year or less	6,300
1-2 years	16,000
2-3 years	0
3-4 years	0
4-5 years	0
Fair value	22,300
Agency Bonds
Debt Securities, Available-for-sale [Line Items]
1 year or less	0
1-2 years	0
2-3 years	5,905
3-4 years	0
4-5 years	0
Fair value	5,905
Municipal Bonds
Debt Securities, Available-for-sale [Line Items]
1 year or less	3,533
1-2 years	0
2-3 years	1,307
3-4 years	0
4-5 years	0
Fair value	$ 4,840