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Fair Value Measurements (Details) - USD ($)
 12 Months Ended
Dec. 29, 2019
Dec. 30, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value, short-term AFS securities $ 201,785,000 $ 371,301,000  
Fair value, long-term AFS securities 251,696,000 213,558,000  
Deferred compensation plan assets 46,000,000.0 38,100,000  
Gross additions to tax positions taken during the prior year 711,000 3,019,000 $ 103,000
Nonrecurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment charge   0 $ 0
Level 1 | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Deferred compensation 23,702,000 23,211,000  
Level 2 | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Deferred compensation 0 0  
Level 3 | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Deferred compensation 0 0  
Estimate of Fair Value Measurement | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Deferred compensation 23,702,000 23,211,000  
Corporate debt securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value, short-term AFS securities 99,126,000 140,168,000  
Fair value, long-term AFS securities 103,737,000 129,624,000  
Corporate debt securities | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value, short-term AFS securities 99,126,000 140,168,000  
Fair value, long-term AFS securities 103,737,000 129,624,000  
Corporate debt securities | Level 1 | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value, short-term AFS securities 0 0  
Fair value, long-term AFS securities 0 0  
Corporate debt securities | Level 2 | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value, short-term AFS securities 99,126,000 140,168,000  
Fair value, long-term AFS securities 103,737,000 129,624,000  
Corporate debt securities | Level 3 | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value, short-term AFS securities 0 0  
Fair value, long-term AFS securities 0 0  
U.S. Treasury securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value, short-term AFS securities 43,095,000 107,485,000  
Fair value, long-term AFS securities 101,438,000 46,737,000  
U.S. Treasury securities | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value, short-term AFS securities 43,095,000 107,485,000  
Fair value, long-term AFS securities 101,438,000 46,737,000  
U.S. Treasury securities | Level 1 | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value, short-term AFS securities 0 0  
Fair value, long-term AFS securities 0 0  
U.S. Treasury securities | Level 2 | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value, short-term AFS securities 43,095,000 107,485,000  
Fair value, long-term AFS securities 101,438,000 46,737,000  
U.S. Treasury securities | Level 3 | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value, short-term AFS securities 0 0  
Fair value, long-term AFS securities 0 0  
US Government Agencies Debt Securities | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value, short-term AFS securities 37,502,000 91,974,000  
Fair value, long-term AFS securities 46,521,000 37,197,000  
US Government Agencies Debt Securities | Level 1 | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value, short-term AFS securities 0 0  
Fair value, long-term AFS securities 0 0  
US Government Agencies Debt Securities | Level 2 | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value, short-term AFS securities 37,502,000 91,974,000  
Fair value, long-term AFS securities 46,521,000 37,197,000  
US Government Agencies Debt Securities | Level 3 | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value, short-term AFS securities 0 0  
Fair value, long-term AFS securities 0 0  
Commercial paper      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value, short-term AFS securities 12,561,000 8,177,000  
Commercial paper | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value, short-term AFS securities 12,561,000 8,177,000  
Commercial paper | Level 1 | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value, short-term AFS securities 0 0  
Commercial paper | Level 2 | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value, short-term AFS securities 12,561,000 8,177,000  
Commercial paper | Level 3 | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value, short-term AFS securities 0 0  
Certificates of deposit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value, short-term AFS securities 9,501,000 23,497,000  
Certificates of deposit | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value, short-term AFS securities 9,501,000 23,497,000  
Certificates of deposit | Level 1 | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value, short-term AFS securities 0 0  
Certificates of deposit | Level 2 | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value, short-term AFS securities 9,501,000 23,497,000  
Certificates of deposit | Level 3 | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value, short-term AFS securities 0 0  
Debt Securities | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value, short-term AFS securities 201,785,000 371,301,000  
Fair value, long-term AFS securities 251,696,000 213,558,000  
Debt Securities | Level 1 | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value, short-term AFS securities 0 0  
Fair value, long-term AFS securities 0 0  
Debt Securities | Level 2 | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value, short-term AFS securities 201,785,000 371,301,000  
Fair value, long-term AFS securities 251,696,000 213,558,000  
Debt Securities | Level 3 | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value, short-term AFS securities 0 0  
Fair value, long-term AFS securities $ 0 $ 0