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Fair Value Measurements - Summary of Hierarchy for Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Oct. 02, 2016
Jan. 03, 2016
Assets:    
Available-for-sale securities $ 741,569 $ 617,450
Debt securities in government sponsored entities [Member]    
Assets:    
Available-for-sale securities 29,657 14,626
Corporate debt securities [Member]    
Assets:    
Available-for-sale securities 463,292 421,094
U.S. Treasury securities [Member]    
Assets:    
Available-for-sale securities 248,620 181,730
Fair Value, Measurements, Recurring [Member]    
Assets:    
Deferred compensation plan assets 29,901 26,245
Total assets measured at fair value 1,275,063 1,034,941
Liabilities:    
Acquisition related contingent consideration liabilities 5,300 35,000
Deferred compensation liability 28,447 24,925
Total liabilities measured at fair value 33,747 59,925
Fair Value, Measurements, Recurring [Member] | Debt securities in government sponsored entities [Member]    
Assets:    
Available-for-sale securities 29,657 14,626
Fair Value, Measurements, Recurring [Member] | Corporate debt securities [Member]    
Assets:    
Available-for-sale securities 463,292 421,094
Fair Value, Measurements, Recurring [Member] | U.S. Treasury securities [Member]    
Assets:    
Available-for-sale securities 248,620 181,730
Fair Value, Measurements, Recurring [Member] | Money market funds (cash equivalents) [Member]    
Assets:    
Money market funds (cash equivalents) 503,593 391,246
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]    
Assets:    
Total assets measured at fair value 752,213 572,976
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | U.S. Treasury securities [Member]    
Assets:    
Available-for-sale securities 248,620 181,730
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Money market funds (cash equivalents) [Member]    
Assets:    
Money market funds (cash equivalents) 503,593 391,246
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]    
Assets:    
Deferred compensation plan assets 29,901 26,245
Total assets measured at fair value 522,850 461,965
Liabilities:    
Deferred compensation liability 28,447 24,925
Total liabilities measured at fair value 28,447 24,925
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Debt securities in government sponsored entities [Member]    
Assets:    
Available-for-sale securities 29,657 14,626
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Corporate debt securities [Member]    
Assets:    
Available-for-sale securities 463,292 421,094
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]    
Liabilities:    
Acquisition related contingent consideration liabilities 5,300 35,000
Total liabilities measured at fair value $ 5,300 $ 35,000