Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Dec. 26, 2021	Dec. 27, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, short-term AFS securities	$ 341,075	$ 309,080
Fair value, long-term AFS securities	413,380	286,831
Deferred compensation plan assets	52,500	49,200
Recurring | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation	21,101	22,245
Contingent consideration	7,450	8,431
Level 1 | Recurring | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation	21,101	22,245
Contingent consideration	0	0
Level 2 | Recurring | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation	0	0
Contingent consideration	0	0
Level 3 | Recurring | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation	0	0
Contingent consideration	7,450	8,431
Debt Securities | Recurring | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, short-term AFS securities	341,075	309,080
Fair value, long-term AFS securities	413,380	286,831
Debt Securities | Level 1 | Recurring | Estimate of Fair Value Measurement
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 | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, short-term AFS securities	341,075	309,080
Fair value, long-term AFS securities	413,380	286,831
Debt Securities | Level 3 | Recurring | Estimate of Fair Value Measurement
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	149,548	79,503
Fair value, long-term AFS securities	119,146	97,565
U.S. Treasury securities | Recurring | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, short-term AFS securities	149,548	79,503
Fair value, long-term AFS securities	119,146	97,565
U.S. Treasury securities | Level 1 | Recurring | Estimate of Fair Value Measurement
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 | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, short-term AFS securities	149,548	79,503
Fair value, long-term AFS securities	119,146	97,565
U.S. Treasury securities | Level 3 | Recurring | Estimate of Fair Value Measurement
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
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, short-term AFS securities	107,334	130,301
Fair value, long-term AFS securities	241,055	135,934
Corporate debt securities | Recurring | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, short-term AFS securities	107,334	130,301
Fair value, long-term AFS securities	241,055	135,934
Corporate debt securities | Level 1 | Recurring | Estimate of Fair Value Measurement
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 | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, short-term AFS securities	107,334	130,301
Fair value, long-term AFS securities	241,055	135,934
Corporate debt securities | Level 3 | Recurring | Estimate of Fair Value Measurement
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
Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, short-term AFS securities	55,551	36,525
Certificates of deposit | Recurring | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, short-term AFS securities	55,551	36,525
Certificates of deposit | Level 1 | Recurring | Estimate of Fair Value Measurement
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 | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, short-term AFS securities	55,551	36,525
Certificates of deposit | Level 3 | Recurring | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, short-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	21,145	37,580
Commercial paper | Recurring | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, short-term AFS securities	21,145	37,580
Commercial paper | Level 1 | Recurring | Estimate of Fair Value Measurement
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 | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, short-term AFS securities	21,145	37,580
Commercial paper | Level 3 | Recurring | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, short-term AFS securities	0	0
Municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, short-term AFS securities	3,997
Fair value, long-term AFS securities	13,933	4,984
Municipal securities | Recurring | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, short-term AFS securities	3,997	0
Fair value, long-term AFS securities	13,933	4,984
Municipal securities | Level 1 | Recurring | Estimate of Fair Value Measurement
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
Municipal securities | Level 2 | Recurring | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, short-term AFS securities	3,997	0
Fair value, long-term AFS securities	13,933	4,984
Municipal securities | Level 3 | Recurring | Estimate of Fair Value Measurement
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 | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, short-term AFS securities	3,500	25,171
Fair value, long-term AFS securities	39,246	48,348
US Government Agencies Debt Securities | Level 1 | Recurring | Estimate of Fair Value Measurement
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 | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, short-term AFS securities	3,500	25,171
Fair value, long-term AFS securities	39,246	48,348
US Government Agencies Debt Securities | Level 3 | Recurring | Estimate of Fair Value Measurement
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