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Cash, Cash Equivalents, and Investments - Effective Maturity Dates of Available-for-Sale Investments (Detail)
$ in Thousands
Oct. 01, 2017
USD ($)
Schedule of Available-for-sale Securities [Line Items]  
1 year or less $ 273,261
1-2 years 219,209
2-3 years 98,288
3-4 years 17,223
4-5 years 45,204
5-7 years 6,577
Fair value 659,762
Corporate Bonds  
Schedule of Available-for-sale Securities [Line Items]  
1 year or less 65,569
1-2 years 109,918
2-3 years 77,430
3-4 years 17,223
4-5 years 39,956
5-7 years 1,413
Fair value 311,509
Treasury Bills  
Schedule of Available-for-sale Securities [Line Items]  
1 year or less 70,184
1-2 years 63,602
2-3 years 0
3-4 years 0
4-5 years 0
5-7 years 0
Fair value 133,786
Asset-Backed Securities  
Schedule of Available-for-sale Securities [Line Items]  
1 year or less 47,840
1-2 years 35,502
2-3 years 16,075
3-4 years 0
4-5 years 2,328
5-7 years 5,164
Fair value 106,909
Euro Liquidity Fund  
Schedule of Available-for-sale Securities [Line Items]  
1 year or less 52,312
1-2 years 0
2-3 years 0
3-4 years 0
4-5 years 0
5-7 years 0
Fair value 52,312
Sovereign Bonds  
Schedule of Available-for-sale Securities [Line Items]  
1 year or less 20,945
1-2 years 4,599
2-3 years 3,427
3-4 years 0
4-5 years 0
5-7 years 0
Fair value 28,971
Agency Bonds  
Schedule of Available-for-sale Securities [Line Items]  
1 year or less 7,606
1-2 years 2,719
2-3 years 0
3-4 years 0
4-5 years 2,920
5-7 years 0
Fair value 13,245
Municipal Bonds  
Schedule of Available-for-sale Securities [Line Items]  
1 year or less 8,805
1-2 years 2,869
2-3 years 1,356
3-4 years 0
4-5 years 0
5-7 years 0
Fair value $ 13,030