Cash, Cash Equivalents, and Investments - Effective Maturity Dates of Available-for-Sale Investments (Detail) $ in Thousands	Apr. 01, 2018 USD ($)
Schedule of Available-for-sale Securities [Line Items]
1 year or less	$ 337,629
1-2 years	166,233
2-3 years	111,432
3-4 years	42,846
4-5 years	27,228
5-7 years	8,442
Fair value	693,810
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
1 year or less	108,313
1-2 years	116,223
2-3 years	97,412
3-4 years	36,342
4-5 years	18,961
5-7 years	3,370
Fair value	380,621
Treasury bills
Schedule of Available-for-sale Securities [Line Items]
1 year or less	138,695
1-2 years	3,604
2-3 years	0
3-4 years	0
4-5 years	0
5-7 years	0
Fair value	142,299
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
1 year or less	75,432
1-2 years	35,411
2-3 years	6,923
3-4 years	6,504
4-5 years	2,336
5-7 years	5,072
Fair value	131,678
Sovereign bonds
Schedule of Available-for-sale Securities [Line Items]
1 year or less	6,036
1-2 years	10,995
2-3 years	5,749
3-4 years	0
4-5 years	0
5-7 years	0
Fair value	22,780
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
1 year or less	9,153
1-2 years	0
2-3 years	1,348
3-4 years	0
4-5 years	0
5-7 years	0
Fair value	10,501
Agency bonds
Schedule of Available-for-sale Securities [Line Items]
1 year or less	0
1-2 years	0
2-3 years	0
3-4 years	0
4-5 years	5,931
5-7 years	0
Fair value	$ 5,931