Cash, Cash Equivalents, and Investments - Summary of Available-for-Sale Investments (Detail) $ in Thousands	Jul. 01, 2018 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 626,814
Gross unrealized gains	750
Gross unrealized losses	(1,883)
Fair value	625,681
Treasury Bills
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses	(332)
Treasury Bills | Short-Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	136,706
Gross unrealized gains	3
Gross unrealized losses	(332)
Fair value	136,377
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses	(935)
Corporate Bonds | Short-Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	116,659
Gross unrealized gains	59
Gross unrealized losses	(371)
Fair value	116,347
Corporate Bonds | Long-Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	208,382
Gross unrealized gains	636
Gross unrealized losses	(564)
Fair value	208,454
Asset-Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses	(524)
Asset-Backed Securities | Short-Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	55,459
Gross unrealized gains	0
Gross unrealized losses	(219)
Fair value	55,240
Asset-Backed Securities | Long-Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	48,033
Gross unrealized gains	12
Gross unrealized losses	(305)
Fair value	47,740
Sovereign Bonds
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses	(67)
Sovereign Bonds | Short-Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	7,400
Gross unrealized gains	1
Gross unrealized losses	(26)
Fair value	7,375
Sovereign Bonds | Long-Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	8,977
Gross unrealized gains	35
Gross unrealized losses	(41)
Fair value	8,971
Agency Bonds
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses	(1)
Agency Bonds | Short-Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	29,248
Gross unrealized gains	0
Gross unrealized losses	(1)
Fair value	29,247
Agency Bonds | Long-Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	5,930
Gross unrealized gains	4
Gross unrealized losses	0
Fair value	5,934
Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses	(24)
Municipal Bonds | Short-Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	9,165
Gross unrealized gains	0
Gross unrealized losses	(11)
Fair value	9,154
Municipal Bonds | Long-Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	855
Gross unrealized gains	0
Gross unrealized losses	(13)
Fair value	$ 842