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Cash, Cash Equivalents, and Investments - Gross Unrealized Losses and Fair Values for Available-for-Sale Investments (Detail)
$ in Thousands
Oct. 01, 2017
USD ($)
Schedule of Available-for-sale Securities [Line Items]  
Fair value, less than 12 months $ 171,009
Unrealized losses, less than 12 months (246)
Fair value, 12 months or greater 77,405
Unrealized losses, 12 months or greater (242)
Total fair value 248,414
Total unrealized losses (488)
Treasury Bills  
Schedule of Available-for-sale Securities [Line Items]  
Fair value, less than 12 months 95,174
Unrealized losses, less than 12 months (150)
Fair value, 12 months or greater 33,627
Unrealized losses, 12 months or greater (79)
Total fair value 128,801
Total unrealized losses (229)
Asset-Backed Securities  
Schedule of Available-for-sale Securities [Line Items]  
Fair value, less than 12 months 51,878
Unrealized losses, less than 12 months (55)
Fair value, 12 months or greater 8,770
Unrealized losses, 12 months or greater (2)
Total fair value 60,648
Total unrealized losses (57)
Sovereign Bonds  
Schedule of Available-for-sale Securities [Line Items]  
Fair value, less than 12 months 2,495
Unrealized losses, less than 12 months (5)
Fair value, 12 months or greater 19,854
Unrealized losses, 12 months or greater (69)
Total fair value 22,349
Total unrealized losses (74)
Municipal Bonds  
Schedule of Available-for-sale Securities [Line Items]  
Fair value, less than 12 months 1,356
Unrealized losses, less than 12 months (3)
Fair value, 12 months or greater 0
Unrealized losses, 12 months or greater 0
Total fair value 1,356
Total unrealized losses (3)
Corporate Bonds  
Schedule of Available-for-sale Securities [Line Items]  
Fair value, less than 12 months 20,106
Unrealized losses, less than 12 months (33)
Fair value, 12 months or greater 15,154
Unrealized losses, 12 months or greater (92)
Total fair value 35,260
Total unrealized losses $ (125)