Fair Value Measurements - (Tables)

12 Months Ended

Dec. 26, 2020

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis

The following tables provide the assets and liabilities carried at fair value measured on a recurring basis at December 26, 2020 and December 31, 2019: 

	Fair Value Measurements Using
	Carrying Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
December 26, 2020
Assets:
Available-for-sale debt securities:
Municipal notes and bonds	$	124,640	$	—	$	124,640	$	—
Asset-backed securities		11,708		—		11,708		—
Certificates of deposit		36,373		—		36,373		—
Commercial paper		32,699		—		32,699		—
Corporate bonds		31,582		—		31,582		—
Total assets	$	237,002	$	—	$	237,002	$	—
Liabilities:
Foreign currency forward contracts	$	36	$	—	$	36	$	—
Total liabilities	$	36	$	—	$	36	$	—
December 31, 2019
Assets:
Available-for-sale debt securities:
Municipal notes and bonds	$	81,108	$	—	$	81,108	$	—
Asset-backed securities		10,779		—		10,779		—
Certificates of deposit		30,507		—		30,507		—
Commercial paper		30,708		—		30,708		—
Corporate bonds		36,461		—		36,461		—
Foreign currency forward contracts		120		—		120		—
Total assets	$	189,683	$	—	$	189,683	$	—
Liabilities:
Contingent consideration - acquisitions	$	569	$	—	$	—	$	569
Total liabilities	$	569	$	—	$	—	$	569