Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jul. 04, 2021	Dec. 31, 2020
Assets:
Money market instruments	$ 200	$ 2,464
Financial assets at fair value	734,712
Corporate Bonds
Assets:
Financial assets at fair value	482,236
Treasury Bills
Assets:
Financial assets at fair value	130,961
Asset-Backed Securities
Assets:
Financial assets at fair value	90,265
Agency Bonds
Assets:
Financial assets at fair value	18,960
Sovereign Bonds
Assets:
Financial assets at fair value	5,293
Municipal Bonds
Assets:
Financial assets at fair value	6,997
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Assets:
Money market instruments	200
Economic hedge forward contracts	0
Liabilities:
Economic hedge forward contracts	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Corporate Bonds
Assets:
Financial assets at fair value	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Treasury Bills
Assets:
Financial assets at fair value	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Asset-Backed Securities
Assets:
Financial assets at fair value	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Agency Bonds
Assets:
Financial assets at fair value	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Sovereign Bonds
Assets:
Financial assets at fair value	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Municipal Bonds
Assets:
Financial assets at fair value	0
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Assets:
Money market instruments
Economic hedge forward contracts	47
Liabilities:
Economic hedge forward contracts	585
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Corporate Bonds
Assets:
Financial assets at fair value	482,236
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Treasury Bills
Assets:
Financial assets at fair value	130,961
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Asset-Backed Securities
Assets:
Financial assets at fair value	90,265
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Agency Bonds
Assets:
Financial assets at fair value	18,960
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Sovereign Bonds
Assets:
Financial assets at fair value	5,293
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Municipal Bonds
Assets:
Financial assets at fair value	6,997
Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Assets:
Money market instruments	0
Economic hedge forward contracts	0
Liabilities:
Economic hedge forward contracts	0
Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Corporate Bonds
Assets:
Financial assets at fair value	0
Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Treasury Bills
Assets:
Financial assets at fair value	0
Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Asset-Backed Securities
Assets:
Financial assets at fair value	0
Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Agency Bonds
Assets:
Financial assets at fair value	0
Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Sovereign Bonds
Assets:
Financial assets at fair value	0
Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Municipal Bonds
Assets:
Financial assets at fair value	$ 0