Cash, Cash Equivalents, and Investments - Summary of Available-for-Sale Investments (Detail) $ in Thousands	Apr. 01, 2018 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 695,195
Gross unrealized gains	909
Gross unrealized losses	(2,294)
Fair value	693,810
Treasury bills
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses	(464)
Treasury bills | Short-Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	139,159
Gross unrealized gains	0
Gross unrealized losses	(464)
Fair value	138,695
Treasury bills | Long-Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	3,601
Gross unrealized gains	3
Gross unrealized losses	0
Fair value	3,604
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses	(1,104)
Corporate bonds | Short-Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	108,533
Gross unrealized gains	50
Gross unrealized losses	(270)
Fair value	108,313
Corporate bonds | Long-Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	272,345
Gross unrealized gains	797
Gross unrealized losses	(834)
Fair value	272,308
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses	(624)
Asset-backed securities | Short-Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	75,710
Gross unrealized gains	5
Gross unrealized losses	(283)
Fair value	75,432
Asset-backed securities | Long-Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	56,573
Gross unrealized gains	14
Gross unrealized losses	(341)
Fair value	56,246
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	(12)
Fair value	9,153
Municipal bonds | Long-Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	1,360
Gross unrealized gains	0
Gross unrealized losses	(12)
Fair value	1,348
Sovereign bonds
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses	(78)
Sovereign bonds | Short-Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	6,040
Gross unrealized gains	1
Gross unrealized losses	(5)
Fair value	6,036
Sovereign bonds | Long-Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	16,779
Gross unrealized gains	38
Gross unrealized losses	(73)
Fair value	16,744
Agency bonds
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses	0
Agency bonds | Long-Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	5,930
Gross unrealized gains	1
Gross unrealized losses	0
Fair value	$ 5,931